In 1971, President Richard Nixon announced that the United States would no longer exchange dollars for gold at the fixed rate of $35 per ounce. The Bretton Woods system — which had anchored the global economy since 1944 — was over. The dollar became, in the technical term, a "fiat currency": money backed by nothing more than government decree and collective trust.
This decision confused many people then, and continues to confuse many people now, for an intuitive reason: if money is not backed by gold, what stops governments from simply printing as much as they want? What gives money its value? Where does new money actually come from?
The answers involve a layered system that most people — including most economics students — misunderstand. Money in a modern economy is created primarily not by governments printing currency, but by commercial banks making loans. Central banks influence this process but do not directly control most of the money supply. The Federal Reserve does not "print money" in the way popular commentary suggests. And the relationship between the money supply and inflation is far more complicated than the simple quantity theory implies.
Understanding these mechanics is not merely academic. Debates about inflation, government debt, cryptocurrency, universal basic income, and economic inequality all hinge on contested questions about money creation. Getting the mechanics right is the prerequisite for having a useful opinion on any of them.
"Banks do not, as too many textbooks still suggest, take in deposits and lend them out. They create deposits by making loans." — Bank of England, Money Creation in the Modern Economy (2014)
Key Definitions
Money — In economics, money is defined by three functions: medium of exchange (accepted in trade), store of value (maintains purchasing power over time), and unit of account (used to price goods and services). Modern money is typically categorized by form: physical currency (coins and notes), demand deposits (bank account balances withdrawable on demand), and various broader measures.
M1, M2, M3 — Measures of the money supply with different degrees of inclusiveness. M1 (narrowest) includes physical currency and demand deposits. M2 adds savings deposits, money market accounts, and small-denomination time deposits. M3 (used in Europe) adds larger deposits and institutional money market funds. In the US as of 2023, M2 was approximately $21 trillion.
Base money (M0) — The money created by the central bank: physical currency in circulation plus commercial bank reserves held at the central bank. Also called "high-powered money" or the "monetary base." The Federal Reserve can directly control base money; it cannot directly control M1 or M2.
Bank reserves — The funds commercial banks hold at the central bank, either as vault cash or as electronic deposits. Banks use reserves to settle payments between each other and to meet reserve requirements. The federal funds rate is the rate banks charge each other for overnight lending of reserves.
Fractional reserve banking — A banking system in which banks hold only a fraction of their deposits as reserves and use the rest to make loans. The fraction held is determined by reserve requirements (set by the central bank), prudential considerations, and demand for loans. Under pure fractional reserve theory, the money multiplier = 1/reserve ratio. In practice, the relationship is more complex.
Endogenous money — The view (now accepted by the Bank of England and most post-Keynesian economists) that money creation is primarily driven by loan demand: banks create money "endogenously" (from within the economy) in response to creditworthy borrowers seeking loans, rather than "exogenously" (from outside, from central bank decisions). This contrasts with the textbook "loanable funds" model.
Fiat currency — Money that has value by government decree and collective acceptance rather than by being backed by a commodity. All major world currencies have been fiat currencies since 1971. Fiat currencies are not backed by gold but by the productive capacity of economies, the legal requirement to use them for taxes, and the network effects of universal acceptance.
Seigniorage — The profit governments earn from creating money. When the central bank creates $100 in currency, it costs pennies to produce; the difference is seigniorage. This represents a form of government revenue, though it is usually small relative to other revenue sources.
Quantitative easing (QE) — A monetary policy tool in which the central bank purchases longer-term assets (typically government bonds, sometimes mortgage-backed securities) to increase bank reserves and reduce long-term interest rates when short-term rates are already at or near zero.
Lender of last resort — The role of central banks in providing emergency liquidity to solvent but illiquid banks during financial panics. Bagehot's Rule (1873): lend freely, at a penalty rate, against good collateral. This function prevents bank runs from cascading into economy-wide crises.
Money multiplier — In the textbook model, the ratio of money supply to base money: 1/reserve ratio. With a 10% reserve requirement, $1 of base money theoretically supports $10 of deposits. In practice, the money multiplier is variable and not reliably stable — the Fed's post-2008 QE programs created massive excess reserves without proportional money supply growth, refuting the simple textbook model.
Velocity of money — The average frequency with which a unit of currency is used to purchase goods and services. The quantity theory of money: MV = PQ (money supply × velocity = price level × output). When velocity falls (people and banks hold cash rather than spending), increases in money supply do not necessarily cause inflation.
How Commercial Banks Create Money
The most important thing to understand about modern money creation contradicts intuition: when a bank makes a loan, it does not lend out existing deposits. It creates new money.
The Loan Creation Process
When your bank approves a $10,000 personal loan, the following accounting entries occur:
Bank's balance sheet:
- Asset: +$10,000 (new loan — the bank now has a claim on you for $10,000)
- Liability: +$10,000 (new deposit in your account — the bank now owes you $10,000)
Your account balance increases by $10,000. This money did not exist before. No other customer's account decreased. The bank created $10,000 of new money simply by making a lending decision.
This is not fraud or accounting manipulation — it is the designed mechanism of modern banking. Banks create purchasing power by issuing loans and destroy it when loans are repaid. When you repay $10,000, that money disappears from the money supply (the loan asset and deposit liability both shrink).
The Bank of England stated this explicitly in a 2014 paper: "Whenever a bank makes a loan, it simultaneously creates a matching deposit in the borrower's bank account, thereby creating new money... The reality of how money is created today differs from the description found in some economics textbooks."
What Actually Constrains Bank Money Creation?
If banks can create money by making loans, what prevents unlimited money creation?
Capital requirements: Banks must hold equity capital as a buffer against loan losses. Under Basel III international standards, banks must maintain a Common Equity Tier 1 ratio (equity capital / risk-weighted assets) of at least 4.5%. This limits how many risky loans a bank can make relative to its capital cushion. Running out of capital is more binding than running out of reserves in most circumstances.
Loan demand: Banks can only create money by making loans; they cannot force borrowers to borrow. In recessions or economic uncertainty, creditworthy borrowers don't want loans, and banks become more risk-averse. The 2008-2015 period saw the Fed create massive bank reserves through QE, but bank lending (and money creation) grew slowly because loan demand was weak and banks tightened standards.
Profitability constraints: Banks earn the spread between lending rates and funding costs. If the central bank raises interest rates, funding becomes more expensive, reducing the profit margin on new loans.
Regulatory scrutiny: Regulators can impose lending restrictions, require stress tests, and constrain growth.
Reserve requirements exist but are increasingly vestigial. The US reduced reserve requirements to zero in March 2020. This does not mean banks have no constraints — it means capital requirements and other factors are more relevant.
The Central Bank's Role
The central bank (in the US, the Federal Reserve; in the Eurozone, the European Central Bank; in the UK, the Bank of England) occupies a distinct tier in the monetary system. It is the "bank of banks" — commercial banks hold accounts at the central bank, just as individuals hold accounts at commercial banks.
The central bank creates base money (reserves and physical currency) and uses several tools to influence the broader money supply, credit conditions, and inflation:
The Policy Interest Rate
The Federal Reserve's primary tool is setting the federal funds rate: the target rate for overnight interbank lending of reserves. When banks need to borrow reserves from each other overnight, they pay this rate.
By raising the fed funds rate, the Fed makes borrowing more expensive throughout the economy — mortgage rates, corporate bond rates, and auto loan rates all tend to move with it. Higher rates reduce loan demand (fewer people want $500,000 mortgages at 7% than at 3%), slowing money creation. Lower rates stimulate borrowing and money creation.
From 2022-2023, the Fed raised rates from near zero to 5.25-5.50% to fight the post-pandemic inflation surge — the fastest rate-raising cycle in four decades.
Open Market Operations
The Fed buys and sells government securities (Treasury bonds) to manage reserve levels. When the Fed buys a Treasury bond from a bank, it credits that bank's reserve account — reserves increase. When it sells a bond, reserves decrease.
Before 2008, open market operations were the primary tool for hitting the fed funds rate target. After 2008, with reserves made abundant through QE, the Fed switched to paying interest on reserve balances (IORB) as its main rate-control mechanism.
Quantitative Easing
When short-term interest rates are already near zero (the "zero lower bound"), central banks cannot stimulate further by cutting rates. QE is a way to ease conditions further by purchasing longer-term assets — driving down long-term rates even when short-term rates are at zero.
From 2008-2014, the Fed's balance sheet grew from approximately $900 billion to $4.5 trillion through three rounds of QE, purchasing Treasury bonds and mortgage-backed securities. During COVID-19, it grew from $4.2 trillion (2020) to $9 trillion (2022).
What QE does and does not do:
QE adds reserves to the banking system, but reserves are not the same as money that circulates in the economy. Banks can hold excess reserves at the Fed rather than lending them. From 2009-2015, excess reserves ballooned to over $2 trillion without causing significant consumer price inflation — demonstrating that QE's monetary effects depend heavily on whether banks lend and whether the public wants to borrow.
QE does affect financial markets: by purchasing assets, the Fed drives down yields, pushes investors into riskier assets (the "portfolio rebalancing" channel), and tends to inflate equity prices. Whether this is beneficial or inequitable (primarily benefiting asset owners) is hotly debated.
The History of Money: From Commodity to Credit
Commodity Money
For most of recorded history, money had intrinsic value: gold, silver, copper. The first known coins were minted in Lydia (modern Turkey) around 600 BCE. Commodity money has natural scarcity — you can't produce it without mining — which constrains money supply growth.
The disadvantages are also obvious: gold is heavy, indivisible, and the supply depends on geological accident rather than economic need. Gold rushes (California 1849, South Africa 1880s) created inflation; deflationary periods followed gold scarcity.
The Gold Standard
The classical gold standard (roughly 1870-1914) fixed national currencies to gold at set exchange rates. This created exchange rate stability and constrained inflation but also constrained monetary policy. Countries could not expand money supply during depressions, prolonging downturns. The interwar gold standard (restored after WWI at prewar parities despite changed economic conditions) contributed to the severity of the Great Depression.
John Maynard Keynes called gold the "barbarous relic" in 1923, arguing that the gold standard prevented the monetary flexibility needed for full employment.
Bretton Woods (1944-1971)
After World War II, the Bretton Woods agreement created a dollar-gold standard: the dollar was fixed to gold at $35/ounce; all other currencies were fixed to the dollar. This provided stability while retaining some gold anchor.
The system broke down when the US ran persistent deficits financing Vietnam and Great Society programs, creating more dollars than could be backed by gold at the fixed price. Foreign central banks, especially France, began demanding gold for dollars. Nixon ended convertibility in August 1971, making the dollar purely fiat.
Modern Fiat Money
All major currencies are now fiat. The value of fiat money rests on:
- Legal tender laws: Governments require their currencies for tax payments; this creates fundamental demand
- Network effects: Money is useful because everyone else accepts it
- Institutional credibility: Independent central banks committed to price stability maintain confidence
- Economic output: Money claims on real goods and services produced by the economy
Countries that lose institutional credibility — through corrupt governments, war, or hyperinflation — lose the value of their fiat money. Zimbabwe under Mugabe, Venezuela under Maduro, and Weimar Germany all demonstrate that fiat currency without credible monetary governance collapses.
Inflation: The Money Supply Is Not All That Matters
The quantity theory of money — MV = PQ — suggests that doubling the money supply doubles prices. This simple relationship fails empirically because velocity (V) is not constant.
Post-2008, the Fed tripled the base money supply through QE with minimal inflation. The 2021-2022 inflation surge came despite the Fed's balance sheet not growing unusually fast — it was driven by supply chain disruptions (COVID shutdowns of global manufacturing and shipping), energy price shocks (the Ukraine war), and a surge in goods demand as fiscal stimulus payments chased fewer goods.
The relationship between money supply and inflation depends on:
- Velocity: Whether money circulates quickly (inflationary) or sits in bank reserves (non-inflationary)
- Output gap: Whether the economy is operating at or below capacity
- Inflation expectations: Self-fulfilling dynamics — if workers expect inflation, they demand higher wages, which causes inflation
- Supply conditions: Whether productive capacity keeps pace with demand
Milton Friedman's claim that "inflation is always and everywhere a monetary phenomenon" contains truth — hyperinflation always involves money-financed deficits — but in moderate ranges, the relationship is not mechanical.
Government Deficits and Money Creation
When governments spend more than they collect in taxes, they borrow by issuing bonds. This deficit spending does not itself create money — it transfers savings from bond buyers to government accounts.
However, central banks can (and sometimes do) create money to fund government spending: the central bank buys newly issued government bonds, crediting the government's account with newly created reserves. This is "monetizing the debt" or "debt monetization." In extreme cases, it causes hyperinflation.
Modern Monetary Theory (MMT) argues that governments issuing their own currencies face no financing constraint — they can always create more money — and that the real constraint is inflation. MMT proponents argue deficit spending should be judged by its effects on inflation and employment, not by accounting analogies to household budgets.
Critics counter that MMT understates the risks: currency crises, capital flight, and sudden loss of confidence can cause rapid devaluation; the political economy of "just print more money" tends toward abuse; and exchange rate constraints matter for small open economies.
The debate is substantively important. Most mainstream economists occupy a middle ground: government deficits are not analogous to household debts, but unlimited money creation does risk inflation, and institutional constraints on central bank independence have value.
The Digital Future: CBDCs and Cryptocurrency
Central Bank Digital Currencies (CBDCs) are digital forms of central bank money — like the dollars in your wallet but digital and issued directly by the Fed rather than through commercial banks. Over 100 countries are exploring or developing CBDCs. China's digital yuan (e-CNY) is the most advanced major CBDC, with over 260 million wallets activated.
CBDCs could improve payment efficiency and financial inclusion but raise significant privacy concerns: a digital currency issued by the central bank could theoretically allow governments to track every transaction and program money with restrictions (expiration dates, approved uses).
Bitcoin and cryptocurrencies offer an alternative: money created by algorithm rather than institutional decree, with supply limited by protocol rather than central bank discretion. As explored in how cryptocurrency works, this innovation solves the double-spend problem but introduces new problems of volatility, energy consumption, and regulatory uncertainty.
The fundamental question is old: what should money be? Commodity? Credit? Algorithm? Government decree? The answer has always been political as much as economic.
For related concepts, see how recessions happen, how inflation works, and why inequality grows.
References
- Bank of England. (2014). Money Creation in the Modern Economy. Bank of England Quarterly Bulletin, Q1 2014. https://www.bankofengland.co.uk/quarterly-bulletin/2014/q1/money-creation-in-the-modern-economy
- McLeay, M., Radia, A., & Thomas, R. (2014). Money in the Modern Economy: An Introduction. Bank of England Quarterly Bulletin, Q1 2014.
- Keynes, J. M. (1936). The General Theory of Employment, Interest and Money. Macmillan.
- Friedman, M. (1968). The Role of Monetary Policy. American Economic Review, 58(1), 1–17.
- Bernanke, B. S. (2015). The Courage to Act: A Memoir of a Crisis and Its Aftermath. W. W. Norton.
- Kelton, S. (2020). The Deficit Myth: Modern Monetary Theory and the Birth of the People's Economy. PublicAffairs.
- Werner, R. A. (2014). Can Banks Individually Create Money Out of Nothing? The Theories and the Empirical Evidence. International Review of Financial Analysis, 36, 1–19. https://doi.org/10.1016/j.irfa.2014.07.015
- Bagehot, W. (1873). Lombard Street: A Description of the Money Market. Henry S. King.
- Eichengreen, B. (2008). Globalizing Capital: A History of the International Monetary System (2nd ed.). Princeton University Press.
- Reinhart, C. M., & Rogoff, K. S. (2009). This Time Is Different: Eight Centuries of Financial Folly. Princeton University Press.
Frequently Asked Questions
Where does money actually come from?
Most money in modern economies is created by commercial banks when they make loans. When a bank lends \(10,000, it creates a new \)10,000 deposit in the borrower's account — money that did not exist before. This 'bank money' (deposits) comprises roughly 90-97% of the total money supply in most developed economies. Central banks create 'base money' (cash and reserves), but this is a small fraction of total money.
What is fractional reserve banking?
Fractional reserve banking is a system in which banks hold only a fraction of their deposits as reserves and lend out the rest. If a bank receives \(100 in deposits and keeps \)10 (10% reserve ratio), it can lend \(90. That \)90 becomes a deposit at another bank, which keeps \(9 and lends \)81, and so on. This 'money multiplier' process amplifies the monetary base. However, modern banks are more accurately described as constrained by capital requirements and loan demand rather than by reserve ratios.
What does the Federal Reserve actually do?
The Federal Reserve (the US central bank) has three main tools: setting the federal funds rate (the overnight rate banks charge each other for reserves), conducting open market operations (buying and selling government securities to add or drain reserves), and setting reserve and capital requirements. Its dual mandate is price stability (targeting ~2% inflation) and maximum employment. It also serves as lender of last resort — providing emergency liquidity to prevent bank panics.
What is quantitative easing and does it cause inflation?
Quantitative easing (QE) is central bank asset purchases — buying government bonds and other securities to increase bank reserves and lower long-term interest rates. The Fed's balance sheet grew from \(900 billion (2008) to \)9 trillion (2022) through QE programs. QE did not cause significant consumer price inflation from 2009-2019 because banks held excess reserves rather than lending aggressively. The 2021-2022 inflation surge was more directly related to supply shocks, fiscal stimulus, and demand recovery than to QE itself.
What is Modern Monetary Theory (MMT)?
Modern Monetary Theory argues that for governments that issue their own currency, the federal government cannot 'run out of money' — it creates money by spending and destroys it through taxation. MMT proponents argue the real constraint on government spending is inflation, not solvency. Critics argue MMT underestimates inflation risks, ignores exchange rate constraints, and conflates the accounting identity that deficit spending creates money with a policy prescription to spend without limit.
Why do central banks target 2% inflation rather than 0%?
A 2% inflation target provides a buffer against deflation (falling prices), which is economically dangerous: it encourages consumers to delay purchases (prices will be lower tomorrow), increases real debt burdens, and can trigger deflationary spirals. It also gives monetary policy more room to cut real interest rates. The 2% target was partly accidental — New Zealand adopted it in 1989 and others followed. There is ongoing academic debate about whether a higher target (3-4%) would be preferable.
What causes hyperinflation?
Hyperinflation (conventionally defined as inflation exceeding 50% per month) typically results from governments printing money to fund expenditures when they cannot borrow or collect sufficient taxes — usually during war, economic collapse, or loss of institutional credibility. Historical examples: Weimar Germany (1923, peak monthly rate 29,500%), Zimbabwe (2008, ~89.7 sextillion percent per month), Venezuela (2018-2019). The causal mechanism is loss of confidence in the currency combined with money-financed government deficits.