ChainWhat it assumes · how to break it
Start
The government sets a legal maximum rent below the market equilibrium, for example a cap on private rents in a city where rents have risen fast.
1
As a result, tenants who already have a home pay a lower rent than before.
maximum price
maximum price
Assumes: The cap is set below the equilibrium rent.
But: A cap set above the market rent has no effect on what tenants pay.
2
At the same time, the lower rent raises the quantity of housing demanded while landlords supply fewer properties, creating excess demand.
excess demand · shortage
excess demand · shortage
Assumes: Supply responds to the lower rent.
But: In the short run the housing stock is fixed, so the shortage comes mainly from extra demand.
3
Consequently, rented homes must be rationed by other means, such as waiting lists, landlords picking tenants or informal payments.
non-price rationing
non-price rationing
Assumes: Landlords cannot raise the effective price.
But: Where enforcement is weak, landlords add fees or charges that bring the true cost back towards the market rent.
4
Therefore, consumers who find a home gain consumer surplus while those who cannot lose out, so the overall effect on consumers depends on how far supply falls.
consumer surplus · PES
consumer surplus · PES
Best link to attack
Assumes: Supply is inelastic, so few homes are lost.
Assumes: Supply is inelastic, so few homes are lost.
But: In the long run supply is more elastic: landlords sell up or switch to short-term lets, so many consumers lose access and total consumer surplus can fall.
End
Sitting tenants pay less and gain consumer surplus, but a shortage leaves other consumers unable to rent.
Evaluation chain
- E1However, the gain to consumers depends on the price elasticity of supply of rented housing.
- E2Because supply becomes more elastic over time as landlords sell properties, switch to other uses or stop building homes to rent,
- E3so the shortage grows and the gain to sitting tenants is outweighed by the loss to consumers who cannot rent at all.
- E4So a rent cap helps consumers in the short run but can leave them worse off as a group in the long run, with gains for sitting tenants and losses for newcomers.
The fall in supply builds over years as landlords leave the market and fewer new homes are built to rent.
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Questions this answers
- Explain, using a diagram, the effect of a maximum price on consumer surplus.
- Assess the impact of rent controls on tenants.
- Discuss whether a maximum price is the best way to make housing affordable.
Diagram
Maximum price below equilibrium. Quantity supplied falls to Qs and quantity demanded rises to Qd, giving a shortage of Qd minus Qs. Consumers gain the rectangle between Pe and Pmax up to Qs, transferred from producers, and lose the triangle on units no longer supplied; shade the deadweight loss.
Reverse and related
Removing the cap → rents rise to equilibrium, sitting tenants pay more but the shortage disappears.