The Price Ceiling That Created a Queue
A city council, responding to complaints that rental housing is unaffordable, imposes a binding rent ceiling 20% below the current market-clearing rent on all apartments. Before the policy: 40,000 rental units were occupied at an average rent of 1,500 per month, and vacancy was 4%. Two years later: average rent in covered units is 1,200, but vacancy has fallen to 1%, waiting lists total 9,000 households, and building permits for new apartments have dropped 35%. Landlords report converting units to condominiums and deferring maintenance. Council members point to the lower rent as proof of success; critics point to the queues. A staff economist is asked to evaluate.
1. Explain, using supply and demand reasoning, why a binding price ceiling produces the observed combination of lower nominal rent, lower vacancy, and queues - and why the vacancy rate is the key diagnostic.
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A price ceiling set below equilibrium is binding: quantity demanded rises (more households want units at 1,200) while quantity supplied falls (some landlords exit, convert, or stop building). The gap between quantity demanded and supplied is a shortage, which appears as waiting lists (9,000 households) and non-price rationing.
Vacancy is the diagnostic because it measures the buffer that absorbs shocks. At 4% vacancy the market was roughly balanced; at 1% it is tight, so even small demand shifts cause large queues and search costs. The lower nominal rent is real for those who keep a unit, but the 9,000 on waiting lists are paying in time and insecurity instead of money - the price did not disappear, it changed form.
The 35% drop in permits is the supply response: expected returns on new construction fell, so future supply shrinks, worsening the shortage over time.
2. The council proposes to fix the problem by extending the ceiling to new construction as well. Predict the likely effect and propose an alternative policy that targets affordability without suppressing supply.
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Prediction: Extending the ceiling to new units removes the last incentive to build covered housing. Developers face capped revenue against uncapped cost, so new rental supply falls further; the shortage and queues grow. Over time the covered stock ages and is converted or withdrawn, so the policy can reduce the very quantity of affordable units it intends to protect.
Alternative: Raise supply and target help to those who need it. Options: (1) supply-side measures - streamline permitting, allow higher density, tax vacant/underused parcels - to shift supply right and lower equilibrium rent; (2) demand-side subsidy - a housing voucher paid to low-income households, which raises their effective purchasing power without capping the price landlords receive, preserving the build incentive; (3) a targeted ceiling or inclusionary requirement limited to a share of units, rather than a blanket cap on all stock.
A strong answer notes the tradeoff: vouchers can bid up rents if supply is fixed, so supply measures and targeted subsidies work best together. The key criterion is whether the policy increases the affordable stock or merely redistributes a shrinking one.