Exploring: In 1960, the median price of a new home in the United States was $11,900, roughly two times the median annual household income of $5,600. A young factory worker, a schoolteacher, a nurse - someone who had gone to work after high school and saved modestly for a few years - could plausibly buy a house in most American cities.
The American Dream's material core, the owned home in a decent neighborhood with good schools, was within reach of the American median.
That calculus has changed so dramatically that younger Americans discussing it with their parents often sound like they are describing different countries, which in economic terms they largely are.
By 2022, the median US home price had risen to roughly $430,000 against a median household income of about $70,000 - a ratio of over six to one.
In San Francisco, the ratio exceeds fifteen to one. In the year 2024, a household earning San Francisco's median income qualifies for a mortgage on a home at roughly the fifteenth percentile of that city's market.
This is not an accident, and it is not a mystery. The research on housing unaffordability is unusually consistent for social science: housing is expensive where supply is legally constrained relative to demand.
The cities where housing costs have risen most severely are, without exception, cities where the political and regulatory barriers to building new housing are most intense.
The cities where housing has remained relatively affordable - Houston, Tokyo, most of the American South and Midwest - are places where building is relatively easy.
The divergence is not a market failure in the conventional sense; it is a market outcome from a system of regulations deliberately designed to produce it, maintained by a political economy that benefits those who already own property at the expense of those who do not.
The question is not really "what causes the housing crisis?" The mechanics are well understood. The harder question - the one that explains why the crisis persists despite its being understood - is why the political system has been so resistant to solutions that economists across the ideological spectrum broadly agree on.
"If you think you can separate the geography of opportunity from the affordability of housing, you're wrong. The places where housing costs the most are the places where economic opportunity is concentrated. The housing crisis is an opportunity crisis." - Alain Bertaud, Order Without Design (2018)
Key Definitions
Exclusionary zoning: Land use regulations - including single-family zoning, minimum lot sizes, parking minimums, and height limits - that restrict density and effectively prohibit the construction of affordable housing types in desirable neighborhoods.
Housing supply elasticity: The responsiveness of new construction to rising prices. High-elasticity markets (Houston, Tokyo) produce more housing when prices rise; low-elasticity markets (San Francisco, New York) do not, because regulatory barriers prevent supply response.
NIMBYism: "Not In My Back Yard" - the tendency of existing residents to oppose new development near their homes, typically citing concerns about density, traffic, school capacity, neighborhood character, or home values.
YIMBY movement: "Yes In My Back Yard" - a political movement advocating for zoning reform and increased housing construction, typically framing housing supply as a matter of both economic efficiency and social equity.
Rent control: Price ceilings on rents, which limit how much landlords can charge existing tenants. Distinct from rent stabilization, which limits the rate of rent increases.
Land value tax: A tax on the location value of land, excluding the value of buildings or improvements. Proposed by Henry George (1879) as a way to capture publicly-created land value and incentivize efficient land use.[7]
Homevoter hypothesis: William Fischel's argument that homeowners treat their home as their primary financial asset and vote in local elections to restrict new development that might reduce their home's value or change neighborhood character.
Housing Affordability: US Cities Compared
| Metro Area | Median Home Price (2023) | Median Household Income | Price-to-Income Ratio | Regulatory Environment |
|---|---|---|---|---|
| San Francisco / Bay Area | ~$1,300,000 | ~$130,000 | ~10x | Highly restrictive; CEQA; discretionary review |
| New York City | ~$750,000 | ~$75,000 | ~10x | Restrictive; complex zoning; long approval process |
| Los Angeles | ~$870,000 | ~$72,000 | ~12x | Highly restrictive; Prop 13 exacerbates NIMBY incentives |
| Seattle | ~$720,000 | ~$90,000 | ~8x | Improving; recent upzoning; still restrictive in some areas |
| Austin | ~$480,000 | ~$76,000 | ~6x | More permissive; prices rising but building has followed |
| Houston | ~$320,000 | ~$60,000 | ~5x | Minimal zoning; highest housing supply elasticity in US |
| Minneapolis | ~$340,000 | ~$72,000 | ~4.7x | Recent citywide upzoning (eliminated single-family only, 2019) |
| Tokyo (reference) | ~$650,000 (condo) | ~$45,000 (JPY adj) | ~4-5x | National permissive zoning overrides local restrictions |
Note: Price-to-income ratios above 4-5x indicate housing affordability stress; above 7-8x is widely considered a housing crisis.
The Basic Economics: Supply Meets a Wall
Housing economics begins with a straightforward supply and demand framework that is not in dispute. When more people want to live in a city than there are homes for them, prices rise.
The appropriate market response is for developers to build more homes, attracting new supply until prices stabilize at a level that covers construction costs plus a normal profit.
This is how commodity markets generally work, and it is why the price of shirts and cars has not risen fifteen-fold in real terms since 1960.
What makes housing different is that supply is regulated in ways that no other commodity is regulated. Developers who want to build more shirts can do so by renting factory space and hiring workers.
Developers who want to build more homes in San Francisco must first obtain a zoning variance, a conditional use permit, an environmental impact review under the California Environmental Quality Act (CEQA), and survive a public hearing process in which any neighbor who objects can trigger years of legal challenges.
The result is that when demand rises in San Francisco, new supply does not follow - it is legally blocked - and prices rise instead.
Edward Glaeser and Joseph Gyourko demonstrated this mechanism with rigor in a series of papers beginning in 2003.[1]
In "The Impact of Zoning on Housing Affordability" (2003), they showed that in high-cost cities, housing prices are far above the cost of construction - sometimes three or four times above - and that this gap is not explained by land costs or construction costs alone.
It is explained by what they called the "zoning tax": the premium that buyers pay because regulations prevent the supply from responding to demand.[8]
In Houston, construction costs plus land account for most of the home price. In San Francisco, they account for perhaps a third of it. The rest is the zoning tax.
Exclusionary Zoning: The Mechanism
Single-family zoning is the primary supply-restricting mechanism in most American cities.
By designating the majority of residential land as available only for detached single-family homes - prohibiting duplexes, triplexes, apartment buildings, and any other multi-family form - single-family zoning artificially caps the number of homes that can be built on most residential land.
Consider a 5,000-square-foot lot in a neighborhood within walking distance of jobs and transit. Single-family zoning allows one home on that lot. Under a moderate density zoning regime, that same lot could accommodate a three-story building with six apartments.
Under Tokyo's zoning rules, it might accommodate more. The supply of homes in the neighborhood is thus the neighborhood's land area divided by the minimum lot size - a regulatory ceiling, not an economic outcome.
The additional restrictions compound the effect. Parking minimums - requirements that each new residential unit include one or two off-street parking spaces - add $30,000 to $50,000 per space in construction costs in dense urban areas, where structured parking requires expensive excavation or concrete.
They also consume land that could otherwise be used for housing. Many new apartment projects in American cities would be economically viable if they did not have to provide parking; the parking requirement tips the financial calculus into loss.
Height limits cap density in areas that could efficiently absorb more people. Setback requirements push buildings away from property lines, reducing buildable area. Minimum unit size requirements prevent the construction of smaller, cheaper units that many single people and young adults would prefer.
The California Case: Dysfunction at Scale
California is the sharpest illustration of the housing crisis at work. The state has the largest economy in the United States, a concentration of high-wage jobs in technology, finance, and professional services, and among the highest housing costs in the world.
The Los Angeles metro area adds roughly 100,000 jobs per year and builds roughly 25,000 housing units. San Francisco adds roughly 30,000 jobs per year and builds roughly 3,000 housing units.
The mathematics of this mismatch produce predictable outcomes: displacement of lower-income residents, homelessness, hours-long commutes from affordable exurbs, and the migration of workers who cannot afford California to other states.
The political architecture of this dysfunction is distinctive. Proposition 13, passed by California voters in 1978, capped property tax increases at 2% per year regardless of actual home value appreciation.
A homeowner who bought in San Francisco in 1978 for $80,000 pays property tax on an assessed value that may be $100,000 today, while their neighbor who bought the same type of house in 2020 for $2 million pays taxes on the full current value.
The resulting underassessment of long-held properties creates perverse incentives: long-term homeowners have enormous untaxed paper gains that new development might threaten, while local governments depend on new construction to generate new property tax revenue, yet face political resistance to that construction from Prop 13 beneficiaries who have no fiscal stake in accommodating growth.
California's zoning is administered by 478 independent municipalities, each with its own land use code. Wealthy suburbs in the Bay Area - Atherton, Hillsborough, Palo Alto - are economically integrated into a regional labor market but are not required to house any particular share of the workers who work in that market.
They zone for low density, receive the benefits of regional economic growth, and externalize the housing costs onto other municipalities or onto lower-income households who commute from affordable exurbs.
The Racial Origins of Exclusionary Zoning
Richard Rothstein's "The Color of Law" (2017) documented something that many American urbanists had suspected but had not been fully established in mainstream discourse: exclusionary zoning in the United States has explicitly racial origins.[5]
The Supreme Court's decision in Buchanan v. Warley (1917) struck down explicit racial zoning - ordinances that designated neighborhoods as white or Black by law.[9]
The response by white property owners and local governments was to find race-neutral mechanisms to achieve the same segregation: racially restrictive covenants in deed language, redlining by the Federal Housing Administration (which refused to insure mortgages in racially integrated neighborhoods), and single-family zoning.
In the context of deliberate public policy steering Black families into urban apartments and white families into suburban homes, single-family zoning functioned as a proxy for racial exclusion.
Rothstein's argument is not merely historical. The residential segregation created by these policies persists today in the spatial distribution of schools, wealth, and neighborhood quality. Exclusionary zoning continues to prevent the integration of wealthy, white-dominated suburbs in major metropolitan areas.
The YIMBY framing of housing reform as racial justice rests on this history: loosening single-family zoning is, in part, undoing a racial geography that was deliberately constructed.
NIMBYism as Political Economy
William Fischel's "The Homevoter Hypothesis" (2001) offers the political economic explanation for why exclusionary zoning persists despite its costs.[4] Homeownership concentrates a household's wealth in a single, illiquid, geographically fixed asset - the home.
Unlike a stock portfolio, a house cannot be diversified. Its value is acutely sensitive to neighborhood conditions: nearby development, school quality, crime rates, traffic.
Homeowners therefore have unusually strong incentives to monitor and influence local governance, because local decisions directly affect their primary asset.
Renters, by contrast, are mobile - they can move when conditions deteriorate - and do not hold an asset whose value depends on neighborhood stability. They have weaker incentives to vote in local elections and weaker organizational capacity in local politics.
The political result is a systematic overrepresentation of homeowner preferences in local land use decisions, and homeowner preferences systematically favor restricting new supply.
The community opposition to new housing - variously citing traffic, parking, school capacity, neighborhood character, and design aesthetics - is largely epiphenomenal to the underlying financial interest.
Studies of NIMBY opposition consistently find that the strength of opposition is correlated with proximity to the proposed development and with homeownership rates, rather than with the specific characteristics of proposed projects.
Opposition to a luxury tower and opposition to affordable housing units are both equally intense in most high-cost neighborhoods, suggesting that the specific nature of the proposed development matters less than its existence.
Rent Control: Protection vs Supply
The debate over rent control is one of the most persistently contentious in housing policy, but the empirical research has become unusually clear.
Diamond, McQuade, and Qian's 2019 study in the American Economic Review used San Francisco's 1994 ballot initiative - which extended rent control to smaller apartment buildings - as a natural experiment.[2]
Because the initiative applied to buildings constructed before a specific date, the authors could compare outcomes for tenants in similar buildings on either side of the eligibility cutoff.
The benefits for protected tenants were real and substantial. Tenants in rent-controlled units paid roughly 15% less than market rates and were 19% more likely to remain in their homes over the following two decades.
In a city where displacement is a major quality-of-life issue and where long-term residents are being pushed out by rising costs, these protections represent genuine value.
But landlords responded to rent control by removing units from the rental market - converting apartments to condominiums, demolishing and redeveloping, or selling to owner-occupants. The net effect was a 15% reduction in the supply of rental housing in San Francisco, and a consequent increase in rents in the uncontrolled market.
The study estimated that rent control, in this case, reduced the welfare of renter households in aggregate, even as it provided significant benefits to the subset with protected units.
This does not resolve the normative question: whether protecting existing tenants from displacement - even at some cost to aggregate housing affordability - is a legitimate policy goal. It is.
But the evidence suggests that rent control is better understood as a tenant protection measure than as a housing affordability solution, and that policymakers who want to address affordability broadly need to address supply.
What Actually Works
The international comparison is instructive. Tokyo's housing costs are remarkably moderate for a metropolitan area of 37 million people, despite sustained in-migration and high incomes.
The primary explanation is Japan's national zoning framework, which limits local governments' ability to impose restrictive zoning and has maintained a relatively permissive development environment.[6]
Tokyo added roughly 170,000 new housing units in 2022, compared to roughly 23,000 in Los Angeles, a city with roughly one-third of Tokyo's population.
Tokyo's greater permissiveness has meant that new supply consistently absorbs demand, preventing the price spirals that characterize restricted markets.
Vienna's model is different: roughly 60% of Vienna's residents live in some form of publicly subsidized housing, including the city's famous "social housing" (Gemeindebau) apartments.
Vienna has sustained political commitment to public housing investment since the 1920s, when the Red Vienna municipal government built enormous housing complexes as a deliberate social policy.
The result is a housing market in which the publicly subsidized sector moderates private market rents by providing a genuine alternative - not marginal public housing for the very poor, but quality social housing for a broad cross-section of income levels.
Singapore's Housing Development Board has built and owns housing for approximately 80% of Singapore's population. Virtually every Singaporean family lives in a public apartment at some point in their lives, at subsidized prices, with the option to purchase and resell in a secondary market.
Singapore's housing policy is an extreme case that depends on its particular political economy - a small, wealthy city-state with a one-party government - but it demonstrates that the housing market can be organized very differently from the US model.
Henry George's land value tax, proposed in "Progress and Poverty" (1879) and advocated by contemporary economists including Joseph Stiglitz, Paul Romer, and Alvin Rabushka, addresses the speculative element in housing costs by taxing location value rather than building value.
Because land value is created by public investment - infrastructure, schools, parks - and by the existence of a surrounding community rather than by the landowner's own effort, taxing it does not discourage productive activity.
Taxing building value, by contrast, penalizes construction and improvement. A land value tax creates strong incentives for property owners to develop land efficiently rather than hold underdeveloped land for speculative appreciation.
Several jurisdictions - Pennsylvania, parts of Australia and Estonia - use split-rate property taxes that shift some of the tax burden from buildings to land, with positive supply effects.
The Cost of Not Building
Chang-Tai Hsieh and Enrico Moretti's 2019 paper in the American Economic Review estimated the aggregate cost of housing supply restrictions in terms of foregone economic output.[3]
By modeling the increase in total factor productivity that would result from workers being able to locate in the cities where their skills are most productively deployed - if, that is, they were not priced out of those cities - Hsieh and Moretti estimated that US GDP would be approximately 3.7% higher, if New York, San Francisco, and San Jose had maintained median housing supply elasticity since 1964.
This figure captures only the productivity loss from workers not being in the right city.
It does not capture the welfare loss from long commutes, the displacement of communities, the homelessness that is the acute end of housing unaffordability, or the foregone earnings of workers who remain in lower-productivity locations because they cannot afford to move to higher-productivity ones.
The housing crisis is not a law of nature. It is a policy choice - the accumulated outcome of thousands of local zoning decisions, fiscal incentives for homeownership over rental, and political economies that prioritize existing homeowners over future residents.
Every country and city that has maintained housing affordability has done so through deliberate policy: permissive zoning, public investment in social housing, land value taxation, or some combination.
The American housing crisis is distinctive in its severity precisely because American housing policy - fragmented, captured by homeowner interests, historically shaped by racial exclusion - has been unusually hostile to supply.
For related analysis of how urban planning shapes economic and social outcomes, see How Urban Planning Works. For the broader economic forces driving inequality that housing costs exacerbate, see Why Inequality Grows. For the foundational economic framework, see What Is Supply and Demand.
Sources & Further Reading
- Glaeser, Edward L. and Joseph Gyourko. "The Impact of Zoning on Housing Affordability." Economic Policy Review 9(2): 21-39, 2003. DOI: 10.3386/w8835
- Diamond, Rebecca, Tim McQuade, and Franklin Qian. "The Effects of Rent Control Expansion on Tenants, Landlords, and Inequality: Evidence from San Francisco." American Economic Review 109(9): 3365-3394, 2019. DOI: 10.1257/aer.20181289
- Hsieh, Chang-Tai and Enrico Moretti. "Housing Constraints and Spatial Misallocation." American Economic Journal: Macroeconomics 11(2): 1-39, 2019. DOI: 10.1257/mac.20170388
- Fischel, William A. The Homevoter Hypothesis: How Home Values Influence Local Government Taxation, School Finance, and Land-Use Policies. Harvard University Press, 2001.
- Rothstein, Richard. The Color of Law: A Forgotten History of How Our Government Segregated America. Liveright, 2017.
- Bertaud, Alain. Order Without Design: How Markets Shape Cities. MIT Press, 2018.
- George, Henry. Progress and Poverty. D. Appleton and Company, 1879.
- Gyourko, Joseph and Jonathan Hartley. "Regulation and Housing Supply." NBER Working Paper No. 20536, 2014. DOI: 10.3386/w20536
- Buchanan v. Warley, 245 U.S. 60 (1917). View source