October 2026
September 2026
- Sep 28, 2026ConceptsLeading vs Lagging Indicators ExplainedA leading indicator is a bet: it encodes your theory about what drives the outcome, which is why it has to be both predictive and something you can actually influence. This guide contrasts the two kinds of measurement across timing, actionability and certainty, then covers the three ways leading indicators fail: they get gamed when the number becomes the target, the assumed link to the outcome quietly breaks, and too many of them dilute focus.
- Sep 21, 2026ConceptsThe Map Is Not the Territory: Why Models MisleadBorges imagined cartographers so ambitious they drew a map the size of the empire, coinciding with it point for point, and later generations left it to rot in the desert. The fable's point is that a map's omissions are its function, not its defect, which is why adding detail rarely repairs a model that misled you. The article sorts the real failure modes into omission, bias and staleness, each with a guarding question.
- Sep 14, 2026ConceptsSecond-Order Thinking: Considering the Consequences of ConsequencesFrench colonial Hanoi paid for rat tails as proof, so people caught rats, cut off the tails and released them to breed, and officials began noticing tailless rats in the streets. The historian Michael Vann documented it from the colonial archives, which makes it the well-attested case where the Delhi cobra story Horst Siebert named in 2001 is not. Covers Bastiat and Merton on unanticipated consequences, the premortem, and where to stop the chain.
- Sep 7, 2026ConceptsOccam's Razor: When the Simplest Explanation WinsWilliam of Ockham never wrote the Latin sentence attached to his name; later writers coined it, and Aristotle had argued in the Posterior Analytics for the demonstration resting on fewer postulates. The razor earns its keep probabilistically, since each added assumption is another chance to be wrong, and statistically, since fewer parameters resist overfitting. Medicine keeps a counterweight: Hickam's dictum, that a patient can have as many diseases as they please.
August 2026
July 2026
- Jul 18, 2026ConceptsThe Sunk Cost Fallacy: Why We Throw Good Money After BadSweis and colleagues reported in Science in 2018 that mice, rats and humans all showed sensitivity to sunk costs in a foraging task, and that the bias appeared only after the decision to pursue a reward had been made, not in the deliberation before it. Arkes and Blumer's 1985 theatre study showed the same pull: season ticket holders who paid full price attended more plays than discounted buyers seeing identical performances.
- Jul 15, 2026ConceptsThe Premortem: Imagining Failure Before It HappensMitchell, Russo and Pennington reported in 1989 that people told an outcome had already happened generated roughly 30 percent more possible reasons for it than people asked what might happen. The study measured the quantity and richness of reasons, not their accuracy. Gary Klein built the meeting around that effect, and its second engine is social: once failure is assumed, the sharpest critic wins the exercise instead of looking disloyal.
- Jul 12, 2026ConceptsThe Availability Heuristic: Why Vivid Beats LikelyAsked whether K appears more often as the first or third letter of English words, most people in Tversky and Kahneman's 1973 study said first; in typical English text it is roughly twice as common in third position. Recall ease, not frequency, drove the answer. Schwarz and colleagues sharpened the point in 1991: people asked for six examples of their own assertiveness rated themselves as more assertive than people asked for twelve.
- Jul 9, 2026ConceptsThe Anchoring Effect: How the First Number Shapes the RestKahneman describes an experiment where people estimated a redwood's height after being given either 1,200 feet or 180 feet, anchors 1,020 feet apart. Their mean estimates came out at 844 and 282 feet, a gap of 562 feet, so roughly 55 percent of the distance between the anchors passed into the answers, which Kahneman calls typical. The defenses with a track record: consider the opposite, and commit to your own number first.
- Jul 6, 2026ConceptsSatisficing vs Maximizing ExplainedA satisficer sets a threshold before searching and takes the first option that clears it; a maximizer keeps looking until convinced nothing better exists. The difference is the stopping rule, not the height of the standards, and because the full option set is usually unbounded a maximizer has no natural end point. Use five factors to triage any decision: stakes, reversibility, how often it recurs, how many options there are, and the real value gap between good and best.
- Jul 3, 2026ConceptsHick's Law: Why More Choices Slow You DownHick in 1952 and Hyman in 1953 found that reaction time tracks the information in a choice, measured in Shannon's bits, so every doubling of options adds the same fixed increment rather than doubling the time. That makes the first few options the costly ones and grouping the real lever. The Iyengar and Lepper jam study, where about 30 percent bought from six jams versus roughly 3 percent from twenty-four, has not always replicated.
June 2026
- Jun 22, 2026ConceptsGoodhart's Law: When a Measure Becomes a TargetCharles Goodhart noticed in 1975 that the Bank of England's stable money-supply relationships broke down the moment it started targeting them, because targeting changed the system that produced the correlation. Marilyn Strathern gave it the phrasing everyone quotes in 1997. Manheim and Garrabrant later split it into four mechanisms, and Choi, Hecht and Tayler found surrogation deepens exactly when pay is tied to the proxy.
- Jun 5, 2026ConceptsCognitive Bias Evidence Map: Robust vs. Failed-to-Replicate BiasesNot every famous bias is equally well supported. This map rates ten effects by the strength of the record behind them, separating the ones tested at large scale and failed from the ones never tested at large scale at all, like the planning fallacy. The sharpest case is ego depletion: a pre-registered replication across 23 labs with 2,141 participants returned d = 0.04, a confidence interval straddling zero.
- Jun 1, 2026ConceptsBetter Decisions Under Uncertainty: A Practical Guide and ToolkitA sound decision can still produce a bad outcome, and luck can hide weak reasoning, so the only thing you can improve is the process. The sharpest figure here is a calibration one: when people say they are 90 percent confident, studies consistently find them right roughly 70 percent of the time. From there it works through availability, sunk cost and anchoring, Gary Klein's premortem protocol, Bezos's two-way door test, and a ten-item checklist.
May 2026
April 2026
- Apr 14, 2026ConceptsFirst Principles Thinking: Elon Musk's Approach ExplainedWhere the method came from and when it fails. Musk broke a battery pack into cobalt, nickel, aluminum, carbon and steel, priced each at commodity level, and found roughly 80 dollars per kilowatt-hour against an industry consensus of 600. The article is equally clear on the limits: reasoning up from wrong foundations produces confident errors, and in irreducibly complex domains statistical approaches beat it.
- Apr 13, 2026IdeasThe 2-Minute Rule That Changed Millions of LivesDavid Allen's Getting Things Done put the rule in the clarify stage: if an item takes under two minutes, the overhead of tracking it exceeds the cost of doing it now. James Clear redirected it at habits, scaling a behavior down until it is crossable on a bad day, with the identity rather than the outcome as the point. The most common way it fails is scaling up too fast: one page on day one, two pages on day two, a chapter on day three, stopped entirely by day ten.
- Apr 8, 2026IdeasEssential Mental Models for Decision MakingWhich thinking tools earn their keep and when each applies. Inversion, which Jacobi summarized as always invert, asks what would guarantee failure rather than how to succeed, turning vague aspiration into a prevention checklist. First principles thinking decomposes a problem to fundamentals, as when Musk priced battery raw materials at roughly 80 dollars per kilowatt-hour against an industry consensus of 600.
March 2026
- Mar 12, 2026ConceptsFraming Effects: How Presentation Changes MeaningIn 1981 Tversky and Kahneman described the same disease program two ways. Seventy-two percent of subjects chose the option saving 200 for certain over an equivalent gamble, while seventy-eight percent chose the gamble over 400 dying for certain. Identical math, opposite risk appetite. Also here: Levin and Gaeth on 95 percent fat-free beef, and Johnson and Goldstein's opt-out donation rates of 85 to 99 percent against 4 to 28 percent for opt-in.
- Mar 5, 2026ConceptsWhy Most Decisions Fail Due to Poor FramingFraming decides which decision you are making; analysis only decides how. Paul Nutt spent 20 years studying roughly 400 strategic decisions and reported that about half ended in failure, the most common cause being poor problem formulation rather than poor analysis: decision-makers evaluated options before defining the problem. The page catalogs five framing traps, reframing techniques, and how Kodak framed digital photography as a threat to contain.
- Mar 5, 2026ConceptsWhat Is Decision Making Under Uncertainty?Frank Knight separated risk, where probabilities are known, from uncertainty, where they cannot be meaningfully assigned, and most big decisions sit on the second side. This guide maps four levels of knowability, then covers satisficing, reversible bets, scenario planning and Bayesian updating. Tetlock's Expert Political Judgment study, spanning about 20 years and more than 28,000 forecasts from 284 experts, found most specialists predicted little better than chance.
- Mar 4, 2026ConceptsProbabilistic Thinking for Enhanced Decision-MakingProbabilistic thinking reasons in likelihoods and distributions rather than certainties, and binary thinking destroys your ability to learn: a good 70% bet that loses gets labeled a bad decision. Annie Duke calls that resulting, judging decision quality by outcome instead of process. Why probably means anywhere from 50% to 90% to different people, how P10, P50 and P90 ranges beat point estimates, and how Bayesian updating works in practice.
- Mar 2, 2026ConceptsKey Decision-Making Terms People MisuseWhy decision vocabulary changes the analysis. Knight's 1921 distinction holds that risk describes situations where outcomes are known and probabilities can be meaningfully assigned, while uncertainty does not permit that, so applying statistical tools to the second is a category error. The article also separates credence, a personal belief, from probability, and Simon's 1955 satisficing from optimizing.
February 2026
- Feb 24, 2026ConceptsEthical Tradeoffs Organizations Face in Decision-MakingMost business ethics writing assumes doing right and making money never truly conflict, and that the right course is obvious. Both assumptions are wrong: resources are finite and stakeholders hold legitimate but incompatible interests. Six recurring tradeoffs, from profit against people to efficiency against fairness, each with what is gained and what is sacrificed, and how Boeing's rushed 737 MAX certification shows the cost of choosing speed.
- Feb 24, 2026ConceptsWhat Is Ethical Decision Making?Consequentialism, deontology, virtue ethics, and care ethics each illuminate a different part of a hard choice, and the disagreement between them is itself informative. The page walks a seven-step process from spotting the ethical dimension to reflecting afterward, then names the traps that defeat good intentions: incrementalism, ethical fading, normalization of deviance, and moral licensing.
- Feb 23, 2026ConceptsWhy Good Intentions Still Lead to Bad OutcomesGood intentions set a goal but do not deliver it, because systems adapt, incentives get gamed, and second-order effects compound. Merton's 1936 paper named five separate sources of unanticipated consequences: ignorance, error, imperious immediacy of interest, basic values, and self-defeating prophecy. Each needs a different fix: ignorance calls for research, short-term pressure for institutional structures. Cases include the cobra bounty and Wells Fargo.
- Feb 21, 2026ConceptsHow Values Shape DecisionsValues shape choices through five mechanisms: what you notice, which options you generate, how you weight outcomes, where you draw non-negotiable lines, and how you justify the result afterward. The stated-versus-revealed gap is measurable. Griskevicius, Tybur, and Van den Bergh found that activating status motives raised willingness to buy green products in public contexts but lowered it in private ones, evidence that environmental values can be partly instrumental.
- Feb 20, 2026Concepts4 Moral Frameworks That Explain Every Ethical DilemmaGreene's functional MRI work compared the lever trolley case with the footbridge variant, where you push a man to stop the trolley. Outcomes are structurally identical, but the personal version activated emotion-associated regions far more strongly and subjects refused it. Impersonal dilemmas pull toward consequentialism, personal ones toward deontology. This compares consequentialism, deontology, virtue ethics and care ethics, then tests them on Milgram and Nuremberg.
- Feb 19, 2026ConceptsAnalytical Models vs IntuitionGary Klein found that expert firefighters and commanders rarely compare options, instead recognizing a situation and simulating one response, while Kahneman documented where confident intuition fails. Their 2009 joint paper sets the condition: trust intuition only where real practice meets a high-validity environment with fast, clear feedback. The page contrasts calibrated weather forecasters with stock analysts and revisits Meehl's actuarial formulas.
- Feb 19, 2026ConceptsRule-Based vs Principle-Based EthicsDworkin's distinction is the hinge: rules apply all-or-nothing, while principles state a reason that must be weighed against competing ones. The page sets out when each wins, traffic law and harassment policy against medical and journalism ethics, then six failure modes including rule proliferation, letter-not-spirit gaming, and principles vague enough that opposite actions both claim them. It closes on the layered hybrid.
- Feb 18, 2026ConceptsHow to Choose the Right Mental ModelModel selection is the meta-skill: matching problem type to thinking tool, testing fit by retrodiction and boundary cases, and triangulating with two to four models from different traditions. Tetlock's forecasting research found that foxes, who drew on many models, outperformed hedgehogs organized around one central model, with the gap widest on long-range forecasts inside their own expertise. Foxes noticed a failing model sooner and switched.
- Feb 17, 2026ConceptsStrategic Frameworks That Actually WorkSix strategic frameworks, with the question each one answers and the conditions under which it misleads: Five Forces struggles with platforms, SWOT collapses into list-making, value chain analysis breaks down for software. McGahan and Porter's 1997 study of Compustat segment data found business-unit factors explained about 32 percent of profitability variance against roughly 19 percent for industry effects, which argues for starting with your own capabilities.
- Feb 17, 2026ConceptsWhat Are Mental Models and Why They MatterA mental model is a simplified representation of how something works, and it decides what you notice before reasoning begins. The clearest evidence that model quality beats raw memory comes from Chase and Simon's chess research: shown real positions for five seconds, masters reproduced about 16 pieces to a novice's four, but on randomly arranged boards managed only about 3-4. Also traces model failures at NASA, in 2008 risk models, and at Toyota.
- Feb 5, 2026ConceptsWhat Should Be Measured and WhyA metric deserves tracking only if it aligns with a real goal, is actionable, can be collected reliably, either predicts or measures an outcome, and is not redundant. The article separates outcomes from outputs and drivers, caps each goal at three to seven metrics, and reframes selection through Hubbard's point that a measurement is worth making when the uncertainty it removes is worth more than its cost.
- Feb 4, 2026ConceptsTradeoffs as a Universal LawSix kinds of tradeoff (resource, design, temporal, quality-quantity, exploration-exploitation, risk-return), the questions that surface hidden ones, and six frameworks for choosing. The opening case is the one most people get wrong: American automakers read Toyota's low cost, high quality and fast delivery as proof the tradeoff was gone, when Toyota had traded flexibility, inventory buffers and quick design changes to get there.
- Feb 3, 2026ConceptsEconomic Laws Explained SimplyGneezy and Rustichini's 2000 study added a fine for late pickup at Israeli daycare centers. Late arrivals roughly doubled, and did not return to earlier levels after the fine was removed. The charge turned an obligation into a purchasable option and destroyed a stronger non-monetary incentive. Eight principles in plain language: scarcity, opportunity cost, incentives, marginal thinking, supply and demand, comparative advantage, diminishing returns, and prices as information.
- Feb 3, 2026ConceptsCognitive Principles That Shape DecisionsEight constraints that govern how people actually decide, from Simon's bounded rationality and Cowan's revision of working memory capacity down to roughly four items, through cognitive load, attention scarcity, and dual process theory. Johnson and Goldstein's study in Science shows what follows: opt-out countries reached organ donation rates of 85 to 99 percent while opt-in countries managed 4 to 28 percent, with broadly similar populations and attitudes.
- Feb 2, 2026ConceptsFirst-Order vs Second-Order EffectsFirst-order effects are what you aimed at, second-order effects are how the system answers back, and the second usually matters more. Barron, Kung, and Proserpio found a 10% increase in Airbnb listings in a neighborhood was associated with a 0.42% rise in rents and a 0.76% rise in house prices, as units left the long-term market. Also works through cane toads, France's 35-hour week, and Klein's finding that pre-mortems surfaced about 30% more problems.
January 2026
- Jan 31, 2026ConceptsWhat Is a Principle and Why It MattersRules cover anticipated situations; principles explain why things work, so they transfer to situations no rulebook predicted. The article distinguishes principles from tactics and values, gives four tests for a genuine principle, and shows why competing principles need judgment. Chi, Feltovich and Glaser's 1981 study found novices grouped physics problems by surface features, while experts grouped them by underlying principles.
- Jan 29, 2026ConceptsUnderstanding Cognitive Biases with ExamplesCognitive biases are systematic deviations from rational judgment, not random error, and they affect everyone regardless of intelligence or expertise. Tversky and Kahneman showed a spun wheel landing on 10 or 65 shifted estimates of African nations in the UN from 25% to 45%. Confirmation bias, anchoring, the availability heuristic and Dunning-Kruger, with mitigation that actually works.
- Jan 28, 2026ConceptsBehavioral Economics Explained SimplyStarting from Kahneman and Tversky's 1979 demonstration that people turn risk-averse for gains and risk-seeking for losses, the page explains loss aversion, mental accounting, anchoring, availability and choice architecture. It also draws the line the field has had to draw: ego depletion and warm-coffee priming failed to replicate, while a 2019 meta-analysis across 607 studies in 50 countries put loss aversion at roughly 1.69, below the original 2:1 estimate.
- Jan 28, 2026ConceptsHeuristics ExplainedAvailability, representativeness, anchoring, affect and recognition each work well in the environments they fit and fail predictably outside them. The article sets Kahneman and Tversky's biases research against Gigerenzer's ecological rationality case, and reports that Dhami and Ayton found British magistrates deciding bail on roughly two pieces of information matched a logistic regression model using 14 variables.
- Jan 27, 2026ConceptsEmotional Reasoning ExplainedEmotional reasoning treats a feeling as direct evidence about external reality, which is different from letting emotion guide reasoning. Damasio's patient Elliot had intact IQ and language but, stripped of emotional signals by ventromedial damage, could spend forty-five minutes choosing a lunch spot and wrecked his career and marriage. A two-stage method follows: name the feeling, then test it against evidence.
- Jan 24, 2026ConceptsWhy Smart People Make Bad DecisionsIntelligence and rationality come apart, and the gap has a name: Stanovich's dysrationalia. In his research IQ accounts for roughly 20 to 30% of variance in rational thinking tasks, with thinking dispositions carrying the rest. Worse, Kahan found higher numeracy and scientific literacy were associated with stronger motivated reasoning, not weaker. Long-Term Capital Management, with two Nobel laureates on staff, lost $4.6 billion in under four months.
- Jan 6, 2026TechnologyNo-Code vs Custom Code: When to Choose Which ApproachMcKinsey surveyed technology leaders at 600 enterprises and found 63 percent reported deployment at least 50 percent faster with no-code, while 41 percent of those applications required migration to custom code within three years. The researchers read the migration rate as appropriate use rather than failure: organizations that planned for it up front reported higher returns from the no-code phase. This covers the four real cost components and the hybrid patterns.
December 2025
- Dec 25, 2025TechnologyNavigating Security Trade-offs for UsabilitySecurity is a cost-benefit analysis, not an absolute standard. NIST reversed decades of guidance in its 2017 SP 800-63B by dropping mandatory password complexity and rotation, because users answered those rules with sticky notes and predictable patterns. Cormac Herley's 2009 Microsoft Research paper showed why: when compliance costs more than the expected loss, ignoring the advice is rational. Usability failures are security failures.
- Dec 23, 2025TechnologyData-Driven Decision Making: Where It Wins and Where It LiesWells Fargo's cross-selling numbers were strong right up to the discovery of roughly 3.5 million unauthorized accounts. The metric became the target and stopped measuring the thing it stood for. This page pairs that failure with the upside: Brynjolfsson, Hitt and Kim studied 179 large publicly traded firms and found data-driven practices associated with 5 to 6 percent higher output and productivity.
- Dec 19, 2025TechnologyData Interpretation: Avoiding Common PitfallsTufte later rebuilt the analysis with every previous launch included, and the relationship between temperature and damage was unmistakable, with the 31 degree launch far outside anything observed. Absence of a pattern in incomplete data is not evidence of no pattern. The page covers confounding, reverse causation and selection effects, what a p-value does and does not mean, the multiple comparison problem, survivorship bias, and Simpson's paradox.
- Dec 1, 2025TechnologyA Tool Evaluation Framework for Decision-MakingIyengar and Lepper's jam study is the warning about the evaluation itself, since shoppers facing 24 varieties bought far less often than those facing six. The page's sharpest test is whether you can name a specific moment in the last two weeks when this problem actually cost you time, because tools bought for the person you wish you were go unused. It also covers switching costs, exit options and the slump test.
November 2025
- Nov 9, 2025Work SkillsDecision Trees: Visualizing Choices and Their OutcomesHow mapping choices makes uncertainty manageable. Merck faced whether to develop Mectizan for river blindness knowing affected populations in sub-Saharan Africa could not afford it, and Roy Vagelos's team charted outcomes of developing versus not, assigned probabilities to approval, and weighed reputational value against financial loss. The analysis supported development, and the company has since donated billions of treatments.
- Nov 8, 2025Work SkillsProblem Framing: Defining Issues Before Seeking SolutionsTomas Wedell-Wedellsborg surveyed 106 C-suite executives for Harvard Business Review in 2017, and 85% said their organizations very often or often work on solving the wrong problem, while only 1 in 4 had an effective process for checking first. This guide covers the techniques that prevent that waste: 5W+H questioning, current versus desired state, Jobs-to-Be-Done, stakeholder mapping, and a checklist to test a problem statement before you generate solutions.
- Nov 6, 2025Work SkillsStructured Problem Solving: Systematic Steps to SuccessHigh performers invested time understanding the system first, identified causal relationships before acting, and checked outcomes against expectations, so the gap was process discipline rather than intelligence. The page covers defining problems as observable facts rather than interpretations, MECE decomposition, the Five Whys, fishbone diagrams, and Toyota's A3 rule that the measurable target condition gets written before any countermeasure is designed.
- Nov 6, 2025Work SkillsCommon Problem Solving Mistakes That Hinder SolutionsThe most expensive error is solving the wrong problem well. Target opened 124 Canadian stores in its first year, diagnosed empty shelves as supply chain execution, and poured money into logistics before closing every store two years later. The post-mortem found the real causes were poorly selected former Zellers locations in declining malls, an assortment mismatched to Canadian preferences, and prices above cross-border expectations.
- Nov 4, 2025Work SkillsCritical Thinking: Enhancing Decision-Making SkillsKeith Stanovich spent three decades comparing intelligence with rational thinking and found the correlation runs only about r = 0.20 to 0.35, meaning IQ explains roughly 4 to 12 percent of the variance in critical thinking performance. He named the gap dysrationalia: smart people reasoning badly because they lack the dispositions, not the capacity. This covers the core skills, groupthink countermeasures, pre-mortems, steelmanning and red teaming.
- Nov 4, 2025Work SkillsBuilding a Tradeoffs Mindset: Weighing Costs and BenefitsPolaroid is the case in point, since the exploration decision was never made explicitly, it was made by quarterly metrics that rewarded film chemistry and penalized digital work until bankruptcy in 2001. Bastiat named the underlying blindness in 1850 as the seen versus the unseen. The page also borrows Bezos's one-way and two-way doors, noting that failing to tell them apart makes organizations slow on reversible calls and fast on permanent ones.
- Nov 3, 2025Work SkillsLeadership Decisions: When to Act Alone or CollaborateThe page separates four decision types and matches each to an approach, so routine calls get the 70 percent rule Bezos described while irreversible ones get a pre-mortem and a deliberate hunt for dissent. Klein's pre-mortem is the practical core: ask the group to imagine the decision failed a year from now and write down why. That gives people permission to raise concerns that would otherwise read as disloyalty.
- Nov 3, 2025Work SkillsLeading in Uncertainty: Making Decisions Amidst AmbiguityIn March 2020 the pandemic erased about 80% of Airbnb's business within weeks, and Brian Chesky had to decide on layoffs, cash and the IPO without knowing how long it would last. Airbnb restructured, pivoted to local and long-term stays, and went public that December. Why known unknowns, unknown unknowns, radical uncertainty and ambiguity each demand a different response, and why projecting false certainty costs leaders their teams' trust.
October 2025
- Oct 24, 2025Work SkillsTask Prioritization: Understanding What Matters MostIn 1998 Steve Jobs drew a two-by-two grid and cut Apple down to four products: consumer and professional laptops, consumer and professional desktops. Everything else went. This guide works through the tools for making that call at smaller scale: the Eisenhower Matrix separating urgency from importance, Pareto analysis (Tim Ferriss found 5 percent of his supplement customers produced 95 percent of revenue), ICE scoring, forced ranking, and consequence testing.
- Oct 13, 2025Work SkillsWriting for Decision MakersPorter and Nohria's 2018 Harvard Business Review time study of 27 chief executives found they spent 24% of their time on email and written communication, read in windows averaging eight minutes, and came back to a document they had started only 18% of the time. A document that has not delivered its point on page one will not deliver it. The article covers the one-pager, the six-page Amazon memo, the board paper, and when each fits.
September 2025
- Sep 23, 2025IdeasAI Assistants for Decision SupportPhilip Tetlock's study of expert political forecasters found the average expert predicted geopolitical events about as well as a dart-throwing chimpanzee, and the best performers were foxes who sought disconfirming evidence. Kahneman's noise adds unwanted variability to judgments that should be identical. Three categories of AI decision support follow: scenario generators, bias checkers and research summarizers, sharpening inputs rather than making the call.
- Sep 23, 2025Work SkillsTeam Decision-Making: Models and ApproachesIn 2000 Blockbuster was offered Netflix for $50 million and declined, holding 9,000 stores and $6 billion in revenue. By 2010 it was bankrupt. The board was not incompetent: the process filtered out dissent and overweighted current position. Groups hold more information than individuals yet often decide worse, because as Stasser showed they discuss what everyone already knows and suppress what only one person knows.
- Sep 12, 2025IdeasSaaS Ideas Focused on ClaritySix product concepts built on the thesis that organizational clarity is a competitive advantage: decision documentation, assumption mapping, strategy articulation, a clarity editor, meeting gating and a metrics dashboard. Paul Leonardi's 2021 study of 47 organizations found that those with formal practices for documenting decisions and rationale made subsequent similar decisions 34 percent faster and showed 28 percent lower rates of decision reversal.
- Sep 11, 2025IdeasSaaS Ideas Solving Decision FatigueSeven decision-fatigue product concepts get pricing, target buyer and moat: meal planning, meeting prep, product prioritization, decision journaling, workflow automation, creative presets and an analysis-paralysis tool. The case rests on Danziger, Levav and Avnaim-Pesso's study of 1,112 judicial rulings, where parole was granted in roughly 65 percent of cases at the start of a session and roughly 5 percent just before a break.
August 2025
July 2025
- Jul 29, 2025IdeasDecision Support System IdeasIn 1988 the USS Vincennes shot down Iran Air Flight 655, killing all 290 people aboard after mistaking an Airbus A300 for a hostile military aircraft. Defense Department analyses blamed scenario fulfillment: under stress the crew sought data confirming what they already believed. Mitchell, Russo and Pennington found in 1989 that prospective hindsight, imagining the failure has already happened, raised the ability to identify reasons for an outcome by 30 percent.
- Jul 22, 2025ExplainersIntroduction to Ethics: Understanding Right and WrongResearchers analyzed 219 violent public incidents recorded in Amsterdam, Cape Town and Lancaster and found at least one bystander intervened in 91 percent of them. Darley and Latane's lab work had suggested far less: 85 percent helped when alone against 31 percent with four other witnesses present. Real emergencies with visible harm appear to trigger intervention more reliably than ambiguous simulations, though the bystander effect remains documented in unclear situations.
- Jul 21, 2025ExplainersThe Decision-Making Process ExplainedGigerenzer and colleagues tested the naive 1/N rule, divide funds equally, against fourteen sophisticated optimization models across seven stock markets over spans of 10 to 50 years. The simple heuristic matched or beat them out of sample, because the complex models need estimated means and covariances and those estimates carry error. This page covers framing, option generation, reversibility and the finding that inconsistency between judges often outweighs individual bias.
- Jul 16, 2025ExplainersDecision-Making Failures Explained Through Real CasesKodak built the first digital camera in 1975 and spent decades protecting film margins above 60 percent before its 2012 bankruptcy. Blockbuster's 9,000 stores and 65 million members could not be weighed against roughly 800 million dollars a year in late fees. Nokia's collapse from 40 percent market share traces to INSEAD research showing middle managers feared reporting how far Symbian had fallen behind.
- Jul 14, 2025ExplainersCognitive Bias: Real-World Implications AnalyzedGigerenzer documented the dread-risk effect: fear of a statistically rare danger pushed people toward a far more common one. Anchoring is equally stubborn among professionals. Northcraft and Neale gave real estate agents a randomly varied listing price and their valuations moved with it, despite the expertise to price from comparable sales. This page also covers confirmation bias at Theranos, sunk costs on Concorde, and why knowing about a bias does not prevent it.
- Jul 12, 2025ExplainersDecision-Making Checklist for Uncertain SituationsWhy structured prompts beat knowing the principles. A 19-item surgical safety checklist tested across eight hospitals reduced major complications by 36 percent and deaths by 47 percent, and the value was not new knowledge but consistent execution under pressure. Klein found expert pattern-matching works with deep domain experience and fails when novel situations get misclassified as familiar, which is exactly when a checklist earns its place.
- Jul 10, 2025ExplainersEthical Decision ChecklistJames Rest's Four-Component Model located the widest gap between intention and action at moral motivation, not moral reasoning: most people who acted unethically already knew it was wrong and prioritized competing interests anyway. That is why the checklist starts by naming the pressure and defeating what Tenbrunsel and Messick called ethical fading, where reframing a choice in technical terms makes its moral dimension vanish.
- Jul 9, 2025ExplainersProblem-Solving Framework TemplateIn a survey of 106 C-suite executives cited by Thomas Wedell-Wedellsborg, 85 percent said their organizations were not good at diagnosing problems and 87 percent said it carried a significant cost. Dietrich Dorner's simulations found that people who failed catastrophically were not less intelligent, they committed to a solution early and then sought only confirming information. Five phases and a checklist for each follow.
- Jul 7, 2025ExplainersRisk Assessment TemplateMitchell, Russo and Pennington found that prospective hindsight, imagining an outcome has already happened, raised people's ability to name reasons for it by 30 percent over ordinary forward-looking thinking, which is why Gary Klein's pre-mortem works. The template covers seven risk categories, 1-5 probability and impact scales, the risk matrix and its limits, the four responses of avoid, reduce, transfer and accept, plus key risk indicators.
- Jul 5, 2025ExplainersCentralized vs Decentralized Decision MakingPushing approval authority down to team leaders while opening intelligence to everyone compressed JSOC's decision cycle from days to hours, and operational tempo rose from about 10 raids a month in 2004 to roughly 300 by 2006. Haier's 4,000 micro-enterprises cut new product cycles from 36 months to 12 but raised coordination overhead. The article's argument: ambiguity about who decides costs more than either structure, so write the decision rights down.
- Jul 4, 2025ExplainersIntuition vs Analytical Decision MakingGary Klein interviewed 26 fire commanders averaging 23 years of experience across 156 decision points and found they seldom generated multiple options; they recognized the situation, simulated one action and acted. Expert and naive intuition feel identical from inside, which is why Tetlock's work matters: his superforecasters beat CIA analysts working from classified data by roughly 30 percent on Brier scores, through probabilistic habits rather than better hunches.
- Jul 1, 2025ExplainersSpeed vs Accuracy in Decision MakingSullenberger had about 208 seconds after the bird strike, and NTSB simulations found that pilots who turned back immediately sometimes reached a runway, while every attempt failed once pilots spent even 35 seconds assessing first. Bezos frames the counterpart rule for business: classify decisions as reversible or irreversible, and decide with roughly 70 percent of the information you wish you had rather than waiting for 90 percent.
June 2025
- Jun 28, 2025ExplainersHow Biases Are FormedCognitive biases are the predictable output of mental shortcuts that evolved for fast decisions, and knowing about one does not disable it any more than measuring the Muller-Lyer lines stops the illusion. Northcraft and Neale's 1987 real estate experiment is the sharpest evidence: professional agents told explicitly to ignore the listing price still anchored on it, producing appraisals nearly as skewed as those of untrained students.
- Jun 25, 2025ExplainersHow Decision Frameworks Actually WorkFrameworks improve the odds without removing uncertainty, and the gains are measurable. After Denmark mandated reference class forecasting for major infrastructure, a 2020 evaluation put average cost overruns near 10 percent against a 45 percent historical average for comparable rail projects. Kennedy's ExComm worked similarly in the Cuban missile crisis: options generated before any was judged, and Kennedy absenting himself so his preference would not anchor the room.
- Jun 24, 2025ExplainersHow Organizations Make DecisionsThe night before Challenger launched, Morton Thiokol engineers recommended against it on O-ring temperature data. During a brief private caucus, general manager Jerald Mason told engineering vice president Bob Lund to take off his engineering hat and put on his management hat. Lund reversed his position and the recommendation became launch. This covers bounded rationality, the garbage can model, the political model, groupthink and what actually improves decisions.
- Jun 19, 2025ExplainersOrigins of Behavioral EconomicsEconomists long defended the rational actor model by arguing that human mistakes are random and cancel out in aggregate. Behavioral economics dismantled that defense by showing the errors run in predictable directions. A rigged wheel of fortune stopping at 10 or 65 moved estimates of African membership in the UN from roughly 25% to roughly 45%, and students handed a coffee mug demanded a median of about $7.12 to sell it while buyers offered only about $2.87.
- Jun 17, 2025ExplainersStep-by-Step: Creating a Decision FrameworkA seven-step build: define the decision, pick five to seven criteria, weight them to 100 percent, score on an anchored 1 to 5 scale, calculate weighted totals, test sensitivity, document the reasoning. Paul Nutt's study of 356 decisions by senior managers found 52 percent failed, and that decisions where a manager advocated for one option failed at roughly twice the rate of those comparing alternatives against explicit criteria.
- Jun 5, 2025ExplainersMaking Mental Models ActionableA model only counts as useful once it changes a decision, question or prediction. Six stages run from first exposure to fluid deployment, and most people stop at the third, spotting a model after the fact but never retrieving it under pressure. Tetlock's Good Judgment Project found superforecasters beat US intelligence analysts holding classified material by roughly 30 percent, and that foxes drawing on many frameworks outperformed hedgehogs.
- Jun 3, 2025ExplainersTranslating Behavioral Economics into Real DecisionsClassical economics assumed homo economicus, a perfectly rational agent describing a species that does not exist. Simon's bounded rationality showed people satisfice rather than optimize, then Kahneman and Tversky showed the errors are systematic even with time and information. The gap this article closes is between knowing and using: understanding anchoring does not stop an asking price from anchoring you, and knowing about present bias does not start your retirement saving.
May 2025
- May 29, 2025TechnologyWhat Is Data Analytics: Turning Data Into DecisionsBrynjolfsson, Hitt and Kim examined 179 large public firms and found that those in the top third of their industry for data-driven decision making were on average 5% more productive and 6% more profitable than competitors. Gartner has estimated poor data quality costs organizations an average of $12.9 million a year. The article separates descriptive, diagnostic, predictive and prescriptive analytics and covers vanity metrics and reporting theater.
- May 25, 2025CultureMoral Intuitions vs. Moral ReasoningHaidt's 2001 incest scenario produced what he named moral dumbfounding: participants stripped of every justification still insisted the act was wrong. His social intuitionist model casts reasoning as a press secretary for a verdict already reached, and the article reports moral evaluations arriving within 200 to 300 milliseconds. Singer and Greene push back, arguing reason can override and slowly reshape intuitions, which is where Rawls's reflective equilibrium fits.
- May 23, 2025CultureValues: Defining Their Importance in SocietyValues are enduring principles about what makes life worthwhile, not goals and not preferences. Shalom Schwartz, who built the most widely used model of basic human values, defines them as beliefs about desirable goals that transcend specific situations and guide behavior. A value applies broadly rather than in one domain, values sit in a hierarchy only visible when two conflict, and they motivate action rather than mere agreement.
- May 22, 2025CultureCross-Cultural Decision Making InsightsNisbett and Masuda found the difference was perceptual, not just a matter of how people reported what they saw, which is what makes holistic and analytic cognition more than a stereotype. Those styles produce different decision processes. This page explains Japanese ringi and nemawashi, where informal consultation settles a decision before the meeting ratifies it, and why Walmart lost roughly a billion dollars in Germany before selling up in 2006.
February 2025
January 2025
- Jan 16, 2025ConceptsRegulatory Focus Theory: Promotion vs. Prevention MindsetsE. Tory Higgins argued in 1997 that pleasure and pain explain the direction of motivation but not the manner. The strongest downstream evidence is regulatory fit: Aaker and Lee found the same vitamin supplement was rated higher when the ad's gain or loss framing matched the reader's own chronic orientation, and Friedman and Forster found promotion-focused participants better at novel conceptual combinations while prevention-focused ones outperformed them at proofreading.
- Jan 14, 2025ConceptsGroupthink: How Cohesion Leads to Poor Decision-MakingAldag and Fuller's 1993 critique in Psychological Bulletin identified the method problem: Janis selected his case studies by outcome, analyzing decisions already known to have failed and finding the symptoms in them, while decisions made under identical group conditions that succeeded were never examined. That makes the model hard to disconfirm. What survives is narrower and still useful: cohesive groups under directive leadership routinely underperform their own members.
- Jan 11, 2025ConceptsConstrual Level Theory: The Effects of DistanceAsked to describe the same errand a year out, they wrote about saving money and building security. Liberman and Trope's 1998 study showed distance shifts attention from feasibility to desirability, which explains a familiar failure: people commit to things for reasons that will not be their motivational state when the day arrives. The page is candid that the temporal findings are robust while the spatial and hypothetical ones are smaller and less consistent.
- Jan 10, 2025ConceptsProspect Theory: Why Framing Changes How Outcomes FeelTversky and Kahneman's 1981 disease problem put the same numbers two ways: 72 percent picked the certain option when it was framed as 200 lives saved, while 78 percent picked the gamble when it was framed as 400 deaths. The 1979 Econometrica model behind that reversal, its value and probability weighting functions, the disposition effect in Odean's brokerage data, and the limits: coefficients vary by country, and awareness alone does not switch the effect off.
- Jan 1, 2025ConceptsAnchoring and Adjustment: Influence of Initial NumbersExpertise does not buy immunity. In Northcraft and Neale's 1987 Tucson study, professional real estate agents appraising the same property varied by roughly $14,000 across manipulated listing prices, students by about $22,000, and the agents almost uniformly denied the listing price had swayed them. Strack and Mussweiler's 1997 selective accessibility account explains why: the anchor primes memory for anchor-consistent facts before adjustment even begins.
December 2024
- Dec 31, 2024ConceptsThe Affect Heuristic: How Feelings Become Facts About RiskRottenstreich and Hsee found in 2001 that when an outcome carried strong feeling, a kiss or an electric shock, people went almost blind to its probability, paying nearly as much to avoid a 1 percent chance of shock as a 99 percent one. That is the affect heuristic: a sense of good or bad doing the work of analysis. It explains Slovic's nuclear power finding that high perceived risk travels with low perceived benefit.
- Dec 25, 2024ConceptsThe Decoy Effect: How Choices Influence Your DecisionsDan Ariely tested The Economist's old subscription page on 100 MIT students. With digital-only at $59, print-only at $125 and print-plus-digital at $125, 84 picked print-plus-digital, 16 picked digital-only, and nobody picked print-only. Remove the option nobody wanted and it flipped: 68 chose digital-only, 32 the premium bundle. Huber, Payne and Puto named this asymmetric dominance in 1982, though a 2014 meta-analysis found the pull weaker when real money is at stake.
- Dec 22, 2024ConceptsChoice Architecture: Designing Decisions for ImpactJohnson and Goldstein found the legal default predicted consent better than culture, income or religiosity, and Madrian and Shea watched 401k participation move from 37 to 86 percent on automatic enrollment alone. The page is honest that its famous cafeteria study is compromised by Wansink's misconduct findings, and it names sludge, the same architecture used to make good choices harder.
- Dec 21, 2024ConceptsAttribution Theory: Misunderstanding ActionsJones and Harris had Duke students read essays for and against Castro's Cuba in 1967. Half were told the writer chose the position; half were told the experimenter assigned it. Logically an assigned essay reveals nothing about belief, and participants knew that. They still rated pro-Castro writers as personally more pro-Castro. The situational constraint was acknowledged then ignored, which is the fundamental attribution error.
- Dec 12, 2024ConceptsUnderstanding Cognitive Bias: Irrational JudgmentsPeter Wason showed Oxford undergraduates the sequence 2, 4, 6 in 1960 and asked them to find the rule by proposing sequences of their own. They offered 8, 10, 12 and declared confidently it was even numbers or constant intervals. The rule was any three ascending numbers. Almost nobody proposed something like 3, 11, 47, which would have tested the theory rather than confirmed it. Biases are systematic, so they compound rather than cancel.
- Dec 7, 2024ConceptsHyperbolic Discounting: Why the Present Always WinsPeople demand a large premium to wait one month starting today, but almost none to wait one month starting a year out, the signature of a discount curve that is steep near and shallow far. The most revealing result is a correction: Kidd, Palmeri and Aslin showed in Cognition in 2013 that children who had just met an adult whose promise went unkept waited far less on the marshmallow task. They were reading an unreliable environment, not failing at willpower.
- Dec 4, 2024ConceptsHindsight Bias ExplainedCaplan and colleagues gave physician reviewers anesthesia cases to judge. Reviewers told the patient had died rated the quality of care significantly lower than reviewers given clinically identical cases without that outcome. The same choices read as negligent or reasonable depending only on what the reviewer knew. Starting with Fischhoff and Beyth's Nixon-in-China study, this is why outcome knowledge rewrites memory, and why warnings barely dent it.
- Dec 2, 2024ConceptsThe Negativity Bias: Why Bad Is Stronger Than GoodSoroka, Fournier and Nir's 2019 PNAS study measured skin conductance and cardiac response to news clips and found negative clips produced larger physiological arousal in every one of 17 politically and culturally diverse nations, suggesting the asymmetry is not culturally learned. Gottman's lab put the ratio for enduring marriages near 5 positive interactions to 1 negative, while couples heading for divorce clustered around 0.8 to 1.
- Dec 1, 2024ConceptsWhat Is the Status Quo BiasJohnson and Goldstein's 2003 Science analysis of European organ donation found consent rates of 85.9 to 99.98 percent in opt-out countries against 4.25 to 27.5 percent in opt-in ones, with survey support for donation similar across them. Madrian and Shea's 2001 study of one company's switch to automatic 401(k) enrollment saw new-employee participation move from about 37 to 86 percent. The article separates the bias from rational switching costs.
November 2024
- Nov 29, 2024ConceptsChoice Overload: When More Options Produce Fewer DecisionsAt Draeger's Market in 1995, Iyengar and Lepper's 24-jam tasting table drew 60 percent of passing shoppers against 40 percent for the 6-jam table, yet 30 percent of those who stopped at six jams bought a jar versus 3 percent at twenty-four. The effect is real but conditional: Scheibehenne's 2010 meta-analysis of 50 studies found a mean effect size near zero, and Chernev's 2015 review of 99 studies pinned it to four moderators.
- Nov 28, 2024ConceptsThe Endowment Effect: Why We Overvalue What We OwnIn the autumn of 1990, Kahneman, Knetsch and Thaler handed Cornell students a bookstore coffee mug at random. Sellers would not part with theirs below a median of $7.12, while buyers offered a median of $2.87 for the identical object, and a third group choosing between mug and cash valued it at $3.12. Twenty minutes of possession moved the price by a factor of about 2.5 and falsified the Coase theorem's prediction that trade would clear.
- Nov 27, 2024ConceptsThe Overconfidence Effect: The Mistakes of the SmartAlpert and Raiffa asked people for ranges they were 90 percent certain contained the right answer. The truth fell outside those ranges roughly 40 to 50 percent of the time. The error is not boastfulness, it is compressed uncertainty, and Moore and Healy showed in 2008 that lumping it in with the better-than-average effect produced contradictions, since overplacement reverses on hard tasks while overprecision does not. Gigerenzer argues frequency formats shrink the gap.
- Nov 25, 2024ConceptsFraming Effect: How Presentation Influences DecisionsMcNeil, Pauker, Sox and Tversky gave 238 patients, 491 students and 424 physicians a choice between surgery and radiation for lung cancer, with identical data shown as survival or mortality figures. Surgical preference fell from 82 percent in the survival frame to 53 percent in the mortality frame, and the shift was statistically indistinguishable across groups. Trained physicians were as susceptible as medically naive patients. The words, not the numbers, did the work.
- Nov 23, 2024ConceptsWhat Is the Recency Bias: How Recent Events Distort JudgmentGoyal and Wahal examined over 3,400 pension funds across a decade and found they consistently hired investment managers after periods of strong recent performance and fired them after weak ones, with no improvement in subsequent returns from the hiring decisions. These are fiduciaries with professional teams and research budgets, making the same error as retail investors with far more money. Also covers the serial position effect and what actually corrects it.
- Nov 22, 2024ConceptsThe Optimism Bias: Why We Expect the Best OutcomesNeil Weinstein's 1980 study asked 258 undergraduates to compare their own odds of major life events against an average peer. They rated themselves below average on every negative event and above average on every positive one, knowing full well that not everyone can be below average. Tali Sharot's later work found the mechanism that keeps it going: beliefs update strongly toward good news about real risk and much more weakly toward bad news.
- Nov 21, 2024ConceptsGambler's Fallacy: Misconceptions About RandomnessTheir 2016 study found the same corrective pattern in loan officers approving applications and umpires calling pitches, controlling for the merits of each case. A roulette wheel has no memory, but the people watching it keep a ledger, and so do professionals trained for case-by-case objectivity. The page is careful on the hot hand too, noting Miller and Sanjurjo's 2018 correction and that the debate continues rather than treating it as settled illusion.
- Nov 19, 2024ConceptsAnchoring Bias: The First Number Shapes Your MindHow an arbitrary number bends judgment even when everyone knows it is meaningless. Kahneman and Tversky spun a wheel of fortune rigged to land on 10 or 65, then asked what percentage of African countries belong to the UN. Those who saw 10 averaged 25 percent; those who saw 65 averaged 45. Participants watched the wheel being rigged and still could not escape it, because adjustment from an anchor is typically insufficient.
- Nov 18, 2024ConceptsWhat Is a Framework: Principles for Structured ThinkingDemographic segmentation and asking customers what they wanted produced nothing useful. Reframing the question to what job the customer hires a milkshake to do revealed morning commuters buying something to last a long drive, competing against bananas and bagels rather than other milkshakes. The page separates frameworks from models, methodologies and processes, and is blunt that domain mismatch, like applying Five Forces to a platform business, is the common failure.
- Nov 13, 2024ConceptsLoss Aversion: Why Losing $100 Hurts More Than Winning $150Kahneman and Tversky's 1979 prospect theory paper found that most people needed stakes of roughly $200 to $250 before accepting a coin flip risking $100. De Martino, Camerer and Adolphs, in PNAS in 2010, then studied two patients with focal bilateral amygdala damage: both tracked expected value and probability normally, yet both showed dramatically reduced loss aversion. Also covers Boston housing sellers, NFL fourth downs and the cultural variation in the coefficient.
- Nov 12, 2024ConceptsUnderstanding Parkinson's Law: Time Management InsightsParkinson published that arithmetic anonymously in The Economist in 1955, and the satire stuck because the data held. The useful modern test is Ariely and Wertenbroch's deadline experiment, where students who set their own staggered due dates did better than those with none, but students given externally imposed evenly spaced deadlines did best of all. People know they need constraint and still grant themselves too much room.
- Nov 11, 2024ConceptsRegression to the Mean: Statistical Insights ExplainedA senior flight instructor told Kahneman that praising a clean maneuver was followed by worse flying and criticizing a sloppy one by improvement, so reward clearly did not work. He was right about what he saw and wrong about the cause. Extreme runs contain luck that does not repeat, so the next run drifts toward the pilot's true average whatever anyone says. An entire training culture had been built on evidence the mathematics produced by itself.
- Nov 9, 2024ConceptsDunning-Kruger Effect: Misjudging CompetenceMcArthur Wheeler robbed two Pittsburgh banks in 1995 with lemon juice on his face, convinced it made him invisible to cameras. Dunning was struck by the sincerity, not the brazenness. In the 1999 paper, bottom-quartile performers estimated the 62nd percentile and averaged the 12th; top performers guessed 68th and scored 86th. The popular stupid-people-think-they-are-smart curve distorts this: it is an asymmetric effect at the tails, about competence structure rather than ego.
- Nov 7, 2024ConceptsThe Map Is Not the Territory: Why Models Always LieLong-Term Capital Management managed 126 billion dollars of assets on 4.8 billion of equity, with two Nobel laureates among its partners, because it trusted models built on stable correlations. When Russia defaulted in August 1998 those correlations collapsed toward one, LTCM lost 4.6 billion, and the New York Fed brokered a 3.6 billion private bailout. The partners had not miscalculated; they had stopped seeing the model as a map.
- Nov 5, 2024ConceptsInversion: Thinking Backward to Solve ForwardAt Scutari in 1854, Florence Nightingale stopped asking how to save more soldiers and asked what was killing them: ventilation, sewage in the water, overcrowding, unwashed linen. Mortality fell from roughly 42 percent to 2 percent in six months. The same reversal drives Snow's Broad Street map and Amazon's working backward memos. Mitchell, Russo and Pennington found in 1989 that treating an outcome as already past surfaced about 30 percent more reasons for it.
- Nov 4, 2024ConceptsChesterton's Fence: Importance of Understanding ChangeThe 1929 passage is explicit that a reformer who grasps the fence's purpose and clears it anyway is acting within the principle, and only the one who removes what he cannot explain is indicted. Mao's Four Pests Campaign is the hard case: sparrows were destroyed as grain eaters, but they also ate locusts, and the locusts arrived without a predator. The page covers action bias, the illusion of explanatory depth, and when removing a fence anyway is right.
October 2024
- Oct 22, 2024ConceptsUnderstanding Goodhart's Law and Its ConsequencesThe memorable paraphrase about measures becoming targets came later, from Strathern writing on British university audit in 1997. The page's most useful contribution is a taxonomy separating four distinct failure modes, Regressional, Extremal, Causal and Adversarial, because each calls for a different response. It is also careful to flag the famous cobra bounty story as possibly apocryphal while noting the Hanoi rat bounty is historically documented.
- Oct 17, 2024ConceptsOpportunity Cost: The Price of Every ChoiceFrederick, Novemsky, Wang and Dhar showed in the Journal of Consumer Research in 2009 how little of this cost people register: 75% said they would buy a well-reviewed DVD for $14.99, but only 55% did once the question added that buying it left $14.99 less for other things. One sentence moved intent 20 points, meaning the alternative had not been considered at all. Decca, Xerox and Kodak made the same mistake with bigger numbers.
- Oct 15, 2024ConceptsCritical Thinking: A Guide to Clear ReasoningIn 2011 an investment bank published a meticulous 50-page strong-buy analysis: dozens of model tabs, sourced projections, authoritative prose. A year later the product had not sold, the stock had lost 40 percent, and the post-mortem found every major assumption traced back to management presentations. No base rates, no bear case. That is a failure of critical thinking, not intelligence: it distinguishes reasoning well from reasoning impressively.
July 2024
January 2024
- Jan 12, 2024ConceptsThe Scarcity Principle: The Allure of Limited ResourcesWorchel, Lee and Adewole gave people identical cookies from the same batch and varied only how many were visible. Two beat ten, but the group who watched eight removed mid-session rated them highest of all. The page separates the two pathways that produce this, a rarity heuristic that is accurate in environments where supply really tracks quality, and Brehm's reactance, then notes that recognized artificial scarcity turns desire into distrust.
- Jan 9, 2024ConceptsHow Willpower Works: The Science of Self-ControlMartin Hagger's 2016 pre-registered multi-lab study tested ego depletion across 23 labs in 36 countries using the same paradigm, and the effect was not found. Tyler Watts' 2018 replication of Mischel's marshmallow test, with a larger and more socioeconomically diverse sample, found the link between early delay of gratification and later outcomes substantially reduced once socioeconomic status, family stability and cognitive ability were controlled.
December 2023
- Dec 22, 2023ConceptsThe Lindy Effect: Aging and Robustness ExplainedWhy age signals durability for ideas and decline for bodies. Comedians at Lindy's deli on Broadway noticed that the longer a show had run, the longer it was likely to keep running. Mandelbrot referenced it in the 1960s and Taleb named and formalized it in Antifragile in 2012. The boundary condition matters: it applies to books, institutions and technologies, not to people, food or anything with physical decay.
- Dec 14, 2023ConceptsWhy Smart People Make Irrational Financial ChoicesOne illustrative case: an engineer on $180,000 paying minimums on $22,000 of card debt while contributing to a matched retirement account, effectively borrowing at 22 percent to earn 3. He could explain compound interest fluently. What he could not explain was why his behavior diverged from what he knew. Fifty years of behavioral economics documents that gap as patterned, not random, and intelligence does not inoculate anyone.
- Dec 13, 2023ConceptsWhen Your Gut Is Right (and When It Will Wreck You)Kahneman spent a career cataloguing judgment failures, Klein a career documenting expert intuition, and their 2009 paper concluded they had never actually disagreed: they studied different environments. Reliable gut feeling needs a domain whose patterns genuinely predict outcomes, plus practice with timely, accurate feedback. Grove and colleagues' meta-analysis of 136 studies found mechanical prediction equal or superior to expert clinical judgment in 94 percent of cases.
- Dec 4, 2023ConceptsWhat Is Behavioral Finance? When Markets Meet PsychologyBrad Barber and Terrance Odean examined the complete trading records of 66,000 households at a discount brokerage over six years. The most active trading quintile earned net annual returns of 11.4 percent against the market's 17.9 percent, a shortfall of 6.5 percentage points attributable almost entirely to trading costs and to selling better stocks to buy worse ones. Men traded 45 percent more than women and underperformed them by 1.4 percentage points a year.
- Dec 2, 2023ConceptsJeff Bezos's Regret Minimization Decision FrameworkBezos was 30 in 1994, a senior vice president at D.E. Shaw with clear advancement ahead, and the people who knew him thought leaving was a mistake. He projected forward to age 80 and concluded he would not regret trying and failing, but would regret never having tried. Gilovich and Medvec documented why that works: action regrets dominate in the short term, inaction regrets dominate over a life.
November 2023
- Nov 30, 2023ConceptsPre-Mortem Analysis: Anticipating Project FailuresWhy imagining failure as settled beats forecasting it as possible. Mitchell, Russo and Pennington tested this in 1989 by asking participants either what might cause a future event or why an event had already occurred, and the prospective hindsight framing produced roughly 30 percent more reasons, and more specific ones. Klein built the premortem on that mechanism and Kahneman wrote that it has much to commend it.
- Nov 28, 2023ConceptsUnderstanding Financial Decision-Making Through PsychologyBrickman, Coates and Janoff-Bulman published a now-classic 1978 study finding lottery winners were not significantly happier than a control group and took significantly less pleasure in everyday activities. The windfall recalibrated their baseline without changing the structure of their finances. That is the paradox: money matters enormously, yet the relationship to well-being is more psychological than most people realize.
- Nov 26, 2023ConceptsDecision Journaling: Improve Your Decision-Making SkillsBaruch Fischhoff showed in 1975 that once people learn how an event turned out, they misremember the probability they had assigned to it as higher than it was. Reflecting without records means reflecting on a flattering reconstruction. Baron and Hershey added outcome bias in 1988: an identical medical decision was rated better when it happened to end well. A journal captures reasoning, confidence and predictions before either effect lands.
- Nov 18, 2023ConceptsWhat Is Decision Fatigue and Its EffectsBaumeister's 1998 radish study had participants resist cookies then quit sooner on an unsolvable puzzle, and the glucose extension claimed a sugary drink could restore self-control. Direct tests produced inconsistent results and re-analysis raised publication-bias concerns, so glucose is no longer supported as the fuel. Covers the Danziger parole findings, choice overload, and status quo bias.
- Nov 17, 2023ConceptsKey Cognitive Biases and Their Impact on Decision MakingWhich biases matter and what actually reduces them. Kahneman and Tversky's 1974 Science paper identified availability, representativeness and anchoring, and named taxonomies have since grown past 180 entries. Larrick's 2004 review found that teaching people about biases produces modest effects that often fail to generalize, so pre-mortems, appointed dissent and reference class forecasting work better. Gigerenzer argues simple rules often beat optimization.
September 2023
- Sep 24, 2023Work SkillsRemote vs Office vs Hybrid: New Research FindingsBloom, Han and Liang's randomized trial, published in Nature in 2024, found hybrid workers showed no significant productivity difference from full-time office staff, reported higher job satisfaction, and left at a rate about one third lower. The office is not automatically the better room either: Bernstein and Turban's 2018 sensor study found that converting to open plan cut face-to-face interaction by 70 percent as workers retreated into headphones and messaging.
- Sep 23, 2023Work SkillsStartup vs Big Company Career: How to Choose at Every StageWork one example through. You hold 0.2 percent of a company, fully vested, with a $10M liquidation preference stack above you, and it exits at $80M: investors take their $10M first, your share of the remaining $70M is $140,000. Against a $30,000 annual salary discount over four years, the net gain is $20,000. This covers compensation ranges by stage, the breadth-versus-depth learning trade, the different failure modes, and what to ask for before signing.
- Sep 22, 2023Work SkillsFreelancing vs Full-Time: A Financial OverviewA salaried $100,000 is really $125,000 to $130,000 once employer health contributions, a 401(k) match, paid time off and the employer half of payroll tax are counted, all of which a freelancer funds alone while paying both FICA sides. Run the real arithmetic before quitting: at 2,000 hours a year with 60 percent billable, you need roughly $120 an hour just to take home $80,000.
- Sep 18, 2023TechnologySocial Media, SEO, or Paid Ads: Budget Allocation StrategiesRanking is close to binary, since positions one to three take around 40 percent of clicks while anything past ten gets under one percent, and roughly 66 percent of pages have no external backlinks at all. Paid buys speed instead, with legal clicks running $20-100 or more. The page is candid that most channel advice is corrupted by incentive, and that organic Facebook reach now sits near 5 percent of followers.
August 2023
- Aug 21, 2023ExplainersAnalyzing Total Cost of Electric vs Petrol CarsThat is at 15,000 miles a year, where home charging costs roughly $672 against $1,641 in fuel, and maintenance runs about 40 percent lower. Higher mileage tips it to the EV without any incentive. The page is honest about the limits, since apartment dwellers without home charging lose the main saving, and an EV leaves the factory with 40 to 70 percent more manufacturing emissions to pay back.
- Aug 10, 2023ConceptsEvaluating Therapy, Self-Help, and Medication EffectivenessThe mechanisms add rather than overlap, since medication reduces the dysregulation that makes engagement hard while therapy changes the patterns that outlast it. That shows up in relapse, roughly 20 to 30 percent after CBT against 50 to 60 percent for people who responded to medication and then stopped. The page treats medication as a bridge to therapy for moderate to severe presentations rather than a standalone fix.
- Aug 8, 2023ConceptsAnalyzing Renting vs Buying a Home with Key MetricsThat is the 5 percent rule, and comparable rent below the figure favors renting while rent above it favors buying. Early mortgage payments make the point, since month one on a $400,000 loan at 7 percent puts about $2,333 into interest and only $328 into equity. The page is fair to ownership too, noting forced savings, the fixed-payment hedge against rising rents, and leverage that cuts both ways.
- Aug 7, 2023ConceptsThe Planning Fallacy: Underestimating Time and CostKahneman's own curriculum team predicted two years; the textbook took eight. In a 1994 study by Buehler, Griffin and Ross, students predicted finishing an academic project in 33.9 days and actually took 55.5, and only 30 percent were done by the date they had called 99 percent certain. Flyvbjerg's review of 258 transport projects across 20 nations found 90 percent went over budget, with no improvement across 70 years. The fix is the outside view, not more confidence.
- Aug 6, 2023ConceptsIndex Funds vs Individual Stocks: Performance InsightsMost individual stocks underperformed Treasury bills over their own lifetimes, so picking them means betting you can identify that few percent in advance. The fund data points the same way, with roughly 93 percent of US large-cap active funds trailing the index over 20 years. Past winners do not help either, since only about 24 percent of top-quartile funds stay top-quartile, slightly worse than chance.
June 2023
May 2023
March 2023
January 2023
December 2022
- Dec 29, 2022ConceptsWhat Is Narrative Fallacy: How Stories Mislead UsTaleb's term for imposing a causal story on a sequence of events, so a known outcome feels inevitable. Phil Rosenzweig documented it in strategy research: the same company, strategy and leader is described as brilliantly decisive when outcomes are good and recklessly overconfident when they are bad. Denrell's simulations found the performance patterns behind celebrated companies are consistent with random variation that then mean-reverts.
- Dec 22, 2022ConceptsUnderstanding Confirmation Bias in Decision-MakingConfirmation bias explained through the experiment that defined it. Peter Wason showed participants 2, 4, 6 and asked them to find the rule; almost all proposed only sequences that fit their first guess, so the actual rule, any ascending sequence, went undiscovered. Lord, Ross and Lepper found in 1979 that giving both sides the same mixed evidence on capital punishment made each group more confident, which means balanced information does not reliably correct bias.
- Dec 21, 2022ConceptsThe Bandwagon Effect: Impact on Markets and ElectionsWhy people follow crowds against their own judgment. The 1992 informational cascade model of Bikhchandani, Hirshleifer and Welch showed that once enough people make the same visible choice, following is the rational Bayesian response because the crowd's aggregate signal outweighs a private one. That also makes cascades fragile: each follower has discarded their own information, so the whole structure rests on whether the early movers were right.
- Dec 20, 2022ConceptsAvailability Heuristic Psychology: How This Cognitive Bias Works in the BrainPeople shifted from flying to driving because the attacks made air travel vividly available while road risk stayed invisible. The mechanism is retrieval ease standing in for frequency, which is why subjects judged homicide about as common as diabetes when diabetes kills roughly five times as many. Schwarz then showed it runs on felt effort: recalling twelve examples of your own assertiveness makes you feel less assertive than recalling six.
- Dec 19, 2022ConceptsThe Pareto Principle: Understanding the 80/20 RuleWhere the 80/20 rule came from and what it actually claims. Vilfredo Pareto's 1896 study found roughly 80 percent of Italian land held by about 20 percent of the population, and quality pioneer Joseph Juran named the principle after him in 1941 on recognizing the same shape in manufacturing defects. The article is explicit that 80/20 is an empirical approximation rather than a law: real distributions may run 70/30 or 95/5, so the ratio needs verifying in each context.
- Dec 12, 2022ConceptsWhat Is Strategic Thinking and How to Develop ItA plan without prior strategic thinking is an operational budget with aspirational language attached. In a McKinsey survey of more than 2,000 executives, only 23 percent said their planning process led to good strategic decisions. This guide separates thinking from planning, covers systems thinking, long horizons and assumption auditing, works through Five Forces and the real limits of SWOT, and sets out practices that build the capability.
- Dec 11, 2022ConceptsWhat Is a Mental Model and How to Build a Better ToolkitPhilip Tetlock's Expert Political Judgment research tracked roughly 28,000 predictions from 284 experts over about two decades and found the best forecasters were separated not by domain expertise but by cognitive style, drawing on models from several fields instead of filtering everything through one. The article catalogs the models worth learning and covers decision journals, stress testing, and single-model dominance.
- Dec 7, 2022ConceptsUnderstanding Bounded Rationality in Decision MakingHerbert Simon's bounded rationality explained. Simon's argument was not that people are irrational but that rationality must be judged relative to real constraints on information, time and cognitive capacity, and the Royal Swedish Academy awarded him the 1978 Nobel Memorial Prize for this contribution. Classical expected utility theory requires enumerating every option and outcome, which is intractable in real decisions, so people satisfice instead.
- Dec 4, 2022ConceptsWinner's Curse: Why Winning Auctions Can Cost YouWhy winning a competitive bid is itself bad news. Three petroleum engineers named the effect in 1971 after noticing that firms winning offshore oil leases earned the worst returns: whoever submits the highest estimate of an uncertain value has almost certainly overestimated it. Bazerman and Samuelson showed it survives even when participants know the setup, and Andrade, Mitchell and Stafford found acquirer shareholders earned essentially zero across 4,256 mergers.
November 2022
- Nov 30, 2022ConceptsWhat Is Opportunity Cost: A Fundamental Economic ConceptFriedrich von Wieser coined the term in 1914, but the harder finding is how reliably people ignore it. In Shane Frederick and colleagues' 2009 Journal of Consumer Research experiments, simply telling one group that buying a $14.99 video meant not spending the money elsewhere made them significantly less likely to buy, and a follow-up found fewer than 25% of participants raised opportunity costs on their own, economics training included.
- Nov 28, 2022ConceptsLong-Term Thinking: Importance and Challenges ExplainedWhy long-term thinking is hard and which mechanisms work against it. Hyperbolic discounting produces a preference reversal that most people will recognize: $100 today is chosen over $110 in a month, yet $110 in 13 months is chosen over $100 in 12 months, despite the interval being identical. Laibson's work estimated effective annual discount rates of 20 to 40 percent for near-future events against only 2 to 5 percent for distant ones.
- Nov 25, 2022ConceptsWhat Is Debt: Good Debt vs Bad Debt ExplainedPew Charitable Trusts found in 2012 that the typical payday borrower stays indebted five months of the year, paying 520 dollars in fees to repeatedly reborrow 375 dollars, contradicting the short-term framing these products are sold under. The article covers how monthly compounding turns minimum payments into decades of interest, debt-to-income benchmarks, and the snowball versus avalanche evidence.
- Nov 23, 2022ConceptsSunk Cost Fallacy and Its Effect on Decision MakingTwo governments converted the logic into a legal obligation, and a minister defending the program in 1968 argued that the investment already made demanded seeing it through. The lab version is just as clean. Arkes and Blumer tracked Ohio University theater subscribers and found those who paid full price attended more performances, including in bad weather, though the money was gone either way. Staw's Big Muddy study showed the original decider escalates most.
- Nov 22, 2022ConceptsIs a College Degree Still Valuable in 2026?How to run the numbers on a specific degree rather than the question in general. The single largest factor in college ROI is the major, not prestige or location: petroleum engineering carries a debt-to-income ratio around 0.65x while fine arts at a private school reaches 4.6x. The article treats the earnings premium honestly, as a population-level average difference rather than a guaranteed return for any individual.
- Nov 18, 2022ConceptsThinking About Risk: A Practical Framework ExplainedRisk and uncertainty are not the same thing, a distinction Frank Knight drew in 1921. Under risk the probabilities can be estimated from data or theory; under uncertainty they cannot, and you may not even know the full range of possible outcomes, so standard tools become unreliable. Volatility is not risk either: a cash deposit with zero nominal volatility can carry enormous purchasing power risk during high inflation.
October 2022
- Oct 10, 2022ConceptsThe Abilene Paradox: Group Decisions Gone WrongHow groups commit to things nobody wanted. Jerry Harvey named it in 1974 after his family drove to Abilene in 104 degree heat for a meal none of them wanted, each assuming the others did. The mechanism is pluralistic ignorance: private doubt is suppressed because each person assumes their skepticism is unique. The distinction from groupthink matters, because groupthink involves real social pressure while here the agreement is a shared misreading of silence.
- Oct 9, 2022ConceptsWhat Is Parkinson's Law of Triviality (Bikeshedding)C. Northcote Parkinson's 1957 thought experiment is still the sharpest account of it: a committee approves a 10 million pound nuclear reactor in about two and a half minutes, because nobody wants to admit they do not understand nuclear engineering, then spends 45 minutes arguing over a 350 pound bicycle shed that everyone feels qualified to judge. Poul-Henning Kamp named the pattern in a 1999 FreeBSD mailing list post. The cause is asymmetric familiarity.
- Oct 7, 2022ConceptsSurvivorship Bias: The Hidden Graveyard of Failed EvidenceMilitary analysts wanted to reinforce where returning bombers were hit. Wald, at Columbia's Statistical Research Group, read the damage map as a conditional probability: the chance of a hit there given that the plane survived. The clean areas were the lethal ones. Elton, Gruber, and Blake put a number on another version of the same filter, estimating that survivorship-biased mutual fund databases overstated performance by roughly 0.9 percentage points a year.
- Oct 6, 2022ConceptsFrameworks: When to Use and When to Avoid ThemWhat frameworks actually do and when they stop helping. A framework does not supply the answer; it tells you which questions to ask, how to structure the problem and which variables are likely to matter. Some organizations adopt one and improve substantially while others adopt the same one and gain nothing but new meeting vocabulary, and the article argues the difference rarely comes down to the choice of framework but to understanding what it is for and when to abandon it.
- Oct 5, 2022ConceptsHow to Think Like a Scientist in Everyday LifeWhen a belief is tied to group identity, intelligence gets spent on rationalizing the pre-committed position. The correctives are base rates and the outside view, and Flyvbjerg's infrastructure research shows the stakes: nine out of ten large transport projects exceeded their initial cost estimates, with average overruns near 45 percent for rail and 20 percent for roads. The useful question stays simple: what would change my mind?
- Oct 4, 2022ConceptsGame Theory Applications: Navigating Strategic DecisionsFlood and Dresher's 1950 experiment already contradicted the simple prediction. Axelrod later found why cooperation survives: his tournament was won by tit for tat, a few lines of code that cooperates first, retaliates at once, forgives immediately and stays legible to the other player. In noisy conditions, adding occasional forgiveness after a defection beats strict tit for tat by preventing punishment spirals.
September 2022
- Sep 27, 2022ConceptsUnderstanding Exponential Growth and Our LimitationsWhy exponential growth defeats intuition. In the chessboard parable, doubling grains of rice reaches about half a million by the 20th square and roughly 2 billion by the 32nd, the halfway point, yet the 64th square alone exceeds 18 quintillion grains, more rice than human civilization has ever produced. Albert Bartlett delivered his lecture on this over 1,700 times between 1969 and 2013, calling exponential illiteracy a central intellectual failure.
- Sep 9, 2022ExplainersAsymmetric Information in Economics: Key ConceptsIt won the Nobel Prize 31 years later, and the model it set out now predicts a death spiral in unregulated insurance, where sick buyers raise premiums, healthy buyers drop out and premiums rise again. The page separates the four distinct problems the term covers, since hidden information and hidden action call for different remedies. One concrete marker of the gap: Levitt and Syverson found homes owned by real estate agents themselves sold for about 3.7% more.
August 2022
- Aug 31, 2022ConceptsThe Paradox of Choice: Too Many Options Hinder HappinessScheibehenne and colleagues found results that ranged from strong effects to none to the reverse, and the famous jam display result did not consistently replicate across products and populations. Chernev later found the effect holds under specific conditions: complex option sets, no clear task, no prior preferences and no domain experience. The sharper finding is that high maximizers make objectively better choices yet report lower happiness.
- Aug 30, 2022ConceptsMere Measurement Effect: How Questions Alter BehaviorGreenwald and colleagues found in 1987 that asking citizens whether they expected to vote increased actual turnout, and Morwitz, Johnson and Schmittlein found purchase intention surveys raised real purchases. The effect runs through cognitive accessibility, consistency motivation and attitude crystallization. Rodrigues' meta-analysis of 49 studies put the pooled effect at d = 0.27, modest in absolute terms, and it does not create intentions from nothing.
- Aug 29, 2022ConceptsUnderstanding Introspection Illusion: Our Unaware MindsWhy confident explanations of our own choices are often constructed. Nisbett and Wilson argued in 1977 that people cite causes that demonstrably did not operate, as when shoppers picked the rightmost of four identical pairs of stockings and credited texture and knit. Hall and Johansson's choice blindness work went further: participants handed the option they had rejected explained their preference just as fluently, with no signal separating report from confabulation.
- Aug 28, 2022ConceptsWhat Is the Herd Mentality: Why People Follow the CrowdAsch found that roughly 75 percent of participants went along with an obviously wrong group answer at least once, but his more useful result came next: one confederate answering correctly dropped conformity from about 32 percent of trials to 5 to 10 percent, while enlarging the majority past three people barely mattered. What people bend to is the appearance of unanimity. The article links that to information cascades, GameStop, and groupthink at NASA.
- Aug 20, 2022ConceptsValue Investing: How to Evaluate Stocks Like Warren BuffettThe page declines to pick a single explanation, listing arbitrage after publication, book value missing intangibles, suppressed rates favoring distant cash flows, and ordinary cyclicality, noting value then beat growth by roughly 22 percentage points in 2022 as rates rose. Graham's framing survives all of it: Mr. Market's daily prices report his emotional state, not the worth of the business behind them.
- Aug 6, 2022ConceptsMonte Carlo Method: How Randomness Solves Complex ProblemsUsing random sampling where direct calculation will not work. Rather than enumerate every possible state, you run a model many times with randomly drawn inputs and read the distribution of results. Ulam had the idea playing Canfield solitaire in 1946, and with von Neumann and Metropolis applied it to neutron transport, publishing in 1949. Accuracy improves with the square root of the sample count, so halving the error takes four times the runs.
July 2022
- Jul 25, 2022ConceptsUnderstanding Somatic Intelligence: Body-Knowing MindHow the body processes information ahead of conscious reasoning. Damasio's somatic marker hypothesis came from patients with ventromedial prefrontal damage who could analyze a decision thoroughly and still not choose. Bechara and colleagues reported in Science in 1997 that anticipatory skin conductance appeared after roughly 10 card draws while conceptual knowledge emerged near card 50. Oppezzo and Schwartz measured about 60 percent more divergent thinking while walking.
- Jul 24, 2022ConceptsWhat Is the Hot Hand Fallacy: When Streaks Are IllusionsGilovich, Vallone, and Tversky analyzed Philadelphia 76ers shooting and concluded the hot hand was a cognitive illusion. In 2018 Joshua Miller and Adam Sanjurjo showed in Econometrica that conditioning on streaks in a finite sequence systematically understates a shooter's baseline. Corrected, the Cornell shooting experiment shows a statistically significant hot hand. Whether that effect is large enough to change how coaches call plays remains open.
- Jul 20, 2022ConceptsImpact of Availability Heuristic in HealthcareHow the availability heuristic distorts medical judgment. Tversky and Kahneman described it in 1973: people estimate likelihood by how easily an example comes to mind rather than by statistics, demonstrated when participants wrongly judged K more common as a first letter than as a third. In healthcare the same mechanism drives over-testing, because symptom searches surface vivid serious diagnoses that dominate probability estimates regardless of base rates.
- Jul 1, 2022ConceptsWhat Is the Default Effect: Why Pre-Selected Options WinJohnson and Goldstein compared eleven European countries and found survey support for donation was broadly similar while consent rates were not: Germany at 12 percent under opt-in, Austria at 99.98 percent under opt-out. Defaults cut both ways. Madrian and Shea found automatic enrollment lifted 401(k) participation from about 49 to 86 percent, then left many employees stranded at a default contribution rate well below what they needed.
September 2021
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