This may be the single most useful idea on Zesht. Start with a thought experiment.
Ten houses, ten buyers
Imagine ten houses. Ten buyers can each afford $500,000.
Now the government gives every buyer another $100,000.
That’s great. Unless there are still only ten houses.
The buyers are wealthier on paper, but they’re bidding against each other for exactly the same supply. Some of the subsidy — possibly most of it — can simply become a higher selling price. The check goes to the buyer. The money goes to the seller.
Now let builders respond. If higher prices can call forth an eleventh and twelfth house, more of the subsidy stays with buyers as actual housing. Try it yourself in the ten-houses simulator.
Economists call this incidence: who ends up with the benefit of a subsidy, regardless of whose name is on the check. The answer depends on how easily supply can respond and how much competition sellers face.
The same mechanism, four markets
This isn’t just theory. Researchers have measured it — and the answers vary in exactly the way the theory predicts.
| Market | What the evidence shows |
|---|---|
| Housing vouchers | Susin (2002) estimated vouchers raised rents for low-income households by about 16% in the 90 largest metros. Eriksen & Ross (2015) found no average rent effect, but the largest increases near voucher limits in cities where housing supply is inelastic. Collinson & Ganong (2018) found across-the-board voucher increases mainly benefited landlords through higher rents. |
| College | About 60 cents of each additional subsidized-loan dollar showed up in sticker tuition after 2007–08 (NY Fed). Aid-eligible for-profits charge about 78% more than comparable ineligible ones. Public universities, which face cheap competitors, capture under 5% of Pell Grant aid. |
| Health insurance | When Medicare Advantage payments rose, insurers passed about 45% to enrollees as lower premiums and 9% as better benefits. In the least competitive markets pass-through was 13%; in the most competitive, 74%. |
| Childcare | Over half of each dollar of the federal Child and Dependent Care Credit passed through to providers as higher prices and wages. Part of that is pay for a low-wage workforce, not profit. |
Notice the pattern in the health-insurance row. The same subsidy, in the same program, reached consumers more than five times as effectively where sellers had competition. That is the whole argument in one number.
Are we making the buyer richer, or the thing more plentiful?
That leads to a question government programs should ask more often.
A subsidy to buyers can genuinely help individual recipients — and on average, recipients do come out ahead. But the final incidence depends on supply. Where supply is constrained by zoning, licensing, accreditation or simple physical limits, a larger share of each dollar is absorbed by price. And unsubsidized buyers in the same market, often people just above the eligibility cutoff, may end up paying more.
Housing economists Edward Glaeser and Joseph Gyourko concluded that in many high-cost areas, the implicit tax on new construction created by regulation is higher than any reasonable estimate of the harms that regulation prevents.
Sometimes the right answer is both:
- If housing is unaffordable, assistance may be justified for vulnerable households. But making it easier to build attacks the underlying scarcity.
- If college is unaffordable, grants may increase access. But lower-cost alternatives put competitive pressure on price.
- If childcare is unaffordable, credits help parents. But if licensed slots can’t grow, part of the help becomes a higher price.
Supply-side programs aren’t a free lunch either. One study found that, on average, three government-subsidized housing units displace roughly two units the private market would have built anyway. Design matters on both sides: when Dallas indexed voucher limits to neighborhood-level rents instead of raising them everywhere, voucher holders moved to lower-poverty neighborhoods without the broad landlord windfall.
Never analyze a subsidy without analyzing supply. Otherwise we see the check, but miss where the money ultimately goes.
This principle runs through much of Zesht: student loans and tuition, rent control, and insurance price controls are all, at bottom, questions about what happens to price when supply can’t — or isn’t allowed to — respond.
The Zesht box
Follow the incentive
- What behavior does this reward?
- Buying more of the subsidized good — and, for sellers, raising prices up to what subsidized buyers can pay, especially near program caps like voucher payment standards and loan limits.
- What does it discourage?
- Price competition and cost-cutting by sellers, and switching to cheaper unsubsidized substitutes when the subsidy is tied to specific providers.
- What becomes more expensive?
- The subsidized good itself, most in supply-constrained or concentrated markets: rents near voucher caps, sticker tuition at aid-dependent colleges, childcare prices.
- What becomes scarcer?
- Affordable units or slots for households just above the eligibility cutoff, who compete with subsidized buyers without help.
- Who receives the benefit?
- Recipients get most of it on average. Sellers — landlords, some colleges, insurers, providers and their workers — get a share that grows as supply tightens and competition weakens.
- Who ultimately pays?
- Taxpayers, plus unsubsidized buyers in the same market who face higher prices.
- What happens when people have another option?
- When supply can expand or competitors exist, sellers can't hold prices up and more of the subsidy reaches buyers.
Goal → mechanism → result
The scorecard
- 1The goal
- Make essential goods — housing, college, health insurance, childcare — affordable for households who otherwise couldn't buy enough of them.
- 2The mechanism
- Give buyers money or credit (vouchers, grants, loans, tax credits, premium subsidies) instead of, or in addition to, expanding what is produced.
- 3The incentive
- Buyers can bid more. Sellers facing more willing buyers can raise prices when they can't or won't expand output quickly, or when competition is weak.
- 4The observed result
- Partial pass-through to sellers is common: about 60 cents per subsidized-loan dollar in sticker tuition, over half of a childcare tax credit into prices and wages, and 13–74% pass-through to Medicare Advantage enrollees depending on competition.
- 5The unintended consequences
- Unsubsidized buyers in the same market can pay more, subsidies can prop up high-price or low-value suppliers, and budgets grow without a matching increase in quantity.
- 6What supporters say
- Demand subsidies target help to people in need, preserve choice, and usually deliver most of their value to recipients; in competitive markets, little leaks into prices.
- 7What critics say
- Without supply reform, subsidies partly fund sellers; programs get judged by dollars spent rather than units produced, while zoning, licensing and accreditation limits keep supply fixed.
- 8What the evidence actually shows
- Incidence tracks supply and competition. Capture is highest in constrained housing markets, concentrated insurance markets, for-profit and selective private colleges and childcare, and lowest where supply responds or cheap competitors exist.
- 9What remains uncertain
- How much supply responds in the long run, how much pass-through funds real quality or wage improvements rather than profits, and whether paired supply reforms deliver in practice. Supply subsidies also partly crowd out private building.
Questions people ask
Do housing vouchers raise rents?
The evidence is mixed. Susin (2002) estimated vouchers raised low-income rents about 16% in large metro areas, while Eriksen and Ross (2015) found no overall rent effect but larger increases near voucher limits in cities where housing supply is constrained. Collinson and Ganong (2018) found across-the-board voucher increases mainly raised rents rather than neighborhood quality.
Does financial aid make college more expensive?
Sometimes. Aid-eligible for-profit colleges charge about 78% more than comparable ineligible ones, and a New York Fed study found about 60 cents of each additional subsidized-loan dollar showed up in sticker tuition. Public universities, which face low-cost competitors, capture under 5% of Pell Grant aid.
Who benefits from health insurance subsidies?
In Medicare Advantage, insurers passed about 45% of higher government payments to enrollees as lower premiums and 9% as extra benefits. Pass-through ranged from 13% in the least competitive markets to 74% in the most competitive (Cabral, Geruso and Mahoney, 2018).
Do child care subsidies raise child care prices?
One study of the federal Child and Dependent Care Credit found over half of each credit dollar passed through to providers as higher prices and wages (Rodgers, 2018). Part of that raises pay for a low-wage workforce, and provider margins are generally thin.
Sources
- Rent vouchers and the price of low-income housing
- Housing Vouchers and the Price of Rental Housing
- How Do Changes in Housing Voucher Design Affect Rent and Neighborhood Quality?
- The Economic Implications of Housing Supply
- Do Low-Income Housing Subsidies Increase Housing Consumption? (Working Paper 8709)
- Credit Supply and the Rise in College Tuition (Staff Report 733)
- Does Federal Student Aid Raise Tuition? New Evidence on For-Profit Colleges
- The Economic Incidence of Federal Student Grant Aid
- Do Larger Health Insurance Subsidies Benefit Patients or Producers? Evidence from Medicare Advantage
- The Aggregate Effects of Health Insurance: Evidence from the Introduction of Medicare (Working Paper 11619)
- Give credit where? The incidence of child care tax credits
- The Economics of Child Care Supply in the United States
- Housing Choice Vouchers: tenant information
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