Milton Friedman had a gift for diagnosing the gap between policy intent and policy outcome. In a supply-constrained market, he would have recognized immediately what a generation of housing policymakers have repeatedly failed to grasp: subsidizing demand without increasing supply does not make goods more affordable — it makes them more expensive. The subsidy is simply capitalized into the price. The seller captures the benefit. The buyer is no better off than before, and the taxpayer is worse off.
This is not a theoretical concern. The United States now administers 2,509 down payment assistance (DPA) programs — a record high as of Q1 2025 according to Down Payment Resource, up 43 programs in a single quarter. State housing finance agencies, municipal governments, nonprofits, and federal agencies collectively spend billions each year putting money into buyers' hands. The premise is straightforward: reduce the barrier to entry and more people can own homes. The problem is that this premise ignores how markets actually work when supply is fixed.
The Arithmetic of Subsidizing Demand in a Supply-Constrained Market
The logic is elementary. If 100 buyers are competing for 80 homes, and the government gives each buyer an additional $25,000 in purchasing power, there are still only 80 homes. The buyers will simply bid more — until the extra $25,000 is priced into the market. The subsidy flows directly to sellers. Housing economists call this the incidence problem: who actually bears the burden (or captures the benefit) of a policy is often not who the policy is aimed at.
This is precisely the dynamic Thomas Sowell identified in his analysis of "price" versus "cost" — that policies which alter what buyers pay do not necessarily alter the underlying cost of providing housing. In a market where supply cannot quickly respond to increased demand (due to zoning restrictions, permitting delays, and construction bottlenecks), the incidence of a demand subsidy falls almost entirely on the supply side. Sellers raise their asking prices. The subsidy recipient pays more for the home than they would have without the program — exactly offsetting the grant.
The question is not whether this mechanism exists in theory. It does. The question is: how large is the effect in practice?
The Evidence: $177 Billion in Harm for $100 Billion in Subsidies
In October 2024, the AEI Housing Center — building on research published in the Journal of Housing Economics — published a detailed quantitative analysis of the price impact of a $25,000 down payment assistance proposal. The findings are striking.
The AEI researchers estimate that a DPA program reaching 4 million first-time buyers over four years would:
- Affect 75% of all home sales nationally, as recipient buyers become price-setters in their census tracts
- Raise constant-quality home prices by an average of 4.1% in affected markets
- Generate $177 billion in additional costs to all homebuyers in affected tracts over four years — against a subsidy benefit of $100 billion
- Deliver an inflationary boost of approximately $1 trillion to the total stock of homes in affected areas
The net effect is deeply regressive. The program costs buyers $77 billion more than it saves them. Existing homeowners — disproportionately wealthier, older, and already housed — capture the $1 trillion in equity appreciation. First-time buyers, the ostensible beneficiaries, pay inflated prices. Taxpayers fund the subsidy. The housing shortage remains.
The price impact is not uniform. In supply-constrained markets with low inventory, the effect is amplified. AEI estimates range from 0.9% price increase in markets with relatively ample supply to 6.1% in the most constrained metros. In Lexington, Kentucky, where the median first-time buyer home price was $280,000 in early 2024, the $25,000 grant boosts buying power by 9% — an enormous jolt in a market where inventory can be measured in weeks. This is precisely the outcome a sound policy would want to prevent.
The FHA and the Long History of Demand Inflation
The DPA programs of today did not emerge in isolation. They are the latest iteration of a decades-long federal strategy of addressing housing affordability through demand-side finance rather than supply-side reform.
The Federal Housing Administration, established in 1934, introduced mortgage insurance that effectively lowered the credit bar for borrowers — enabling lower down payments and expanding the pool of eligible buyers. This was, structurally, the same intervention: more purchasing power chasing a supply that zoning and regulatory barriers prevented from expanding rapidly. According to the HUD FHA Annual Report for FY 2024, FHA insured over 765,000 single-family forward mortgages in fiscal year 2024 alone — predominantly for first-time buyers. The accumulated demand effect of nine decades of below-market entry terms is not trivial.
Meanwhile, the supply side has not kept pace. NAHB estimates that the U.S. needed approximately 1.2 million additional housing units in 2024 just to restore vacancy rates to historical norms. A Brookings Institution analysis found the country was short 4.9 million housing units as of 2023 relative to mid-2000s levels. New housing starts, tracked by the Federal Reserve via FRED, have remained well below the levels required to close this gap. Every demand subsidy injected into this environment is a subsidy to the shortage — it bids up the price of scarcity rather than remedying it.
Who Actually Wins
Sowell's insight applies with full force here: there are no solutions, only trade-offs. Down payment subsidies are not a solution to housing unaffordability. They are a trade-off that benefits sellers of existing homes (who see prices rise), benefits real estate agents (who earn commissions on higher transaction prices), and benefits the bureaucracies that administer the programs — while imposing costs on first-time buyers who pay inflated prices, on renters who face crowded and more expensive rental markets as fewer units change hands, and on taxpayers who fund the subsidies.
The programs persist not because they work, but because they are politically legible. A politician who announces a $25,000 housing grant generates positive coverage and grateful recipients. The diffuse harm — spread across millions of buyers and renters in the form of higher prices — is invisible to the camera. Hayek called this the fatal conceit: the belief that policymakers can engineer outcomes in complex systems through targeted interventions, without accounting for the adaptive responses of every other participant in the market.
The Path That Actually Reduces Prices
If demand subsidies reliably inflate prices in supply-constrained markets, the prescription is clear: fix the supply constraint, not the demand side. The evidence on supply reform is equally unambiguous. Cities and states that have substantially liberalized zoning — allowing greater density, reducing minimum lot sizes, eliminating parking mandates, streamlining permitting — have produced measurable improvements in affordability. The NAHB analysis notes that "restrictive zoning regulations" are among the primary structural barriers preventing the supply response that would organically reduce prices.
No demand subsidy can substitute for building more homes. The 2,509 down payment assistance programs currently in operation are, at best, redistributive gestures that leave the underlying market unchanged. At worst — and the AEI evidence suggests this is closer to the truth — they actively worsen the affordability crisis they are designed to address. The Friedman test applies: what matters is not what a program is called, but what it does. What down payment subsidies do, in a supply-constrained market, is raise prices. That is not housing policy. It is housing harm with excellent branding.
