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, landlords receive a lower rent on each property they let, so their revenue and producer surplus fall.
producer surplus
producer surplus
Assumes: Landlords comply with the cap.
But: Landlords may add fees or cut spending on maintenance, recovering part of the lost revenue.
4
Therefore, the return on letting falls, so some landlords sell up or move into uncontrolled markets such as short-term lets, and investment in new rented housing falls.
profit signal · incentive
profit signal · incentive
Best link to attack
Assumes: Landlords have other profitable uses for their property.
Assumes: Landlords have other profitable uses for their property.
But: Where other uses are restricted, for example if short-term lets also need a licence, landlords have nowhere else to go and supply falls less.
End
Landlords' revenue, producer surplus and profit fall, and some leave the market.
Evaluation chain
- E1However, the fall in supply depends on what landlords can do with their properties instead.
- E2If selling to owner-occupiers or switching to short-term holiday lets is easy and profitable,
- E3then many landlords leave the regulated market and the number of homes to rent shrinks.
- E4So producer surplus falls for those who remain, and the rental market shrinks most where landlords have good alternatives.
Another way to attack it: If landlords have market power and were earning high profits, the cap can transfer surplus to tenants without cutting supply much.
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Questions this answers
- Explain the effect of a maximum price on producer surplus.
- Assess the impact of rent controls on landlords.
- Analyse why a maximum price may reduce supply in the long run.
Diagram
Maximum price below equilibrium. Producer surplus falls by the rectangle between Pe and Pmax up to Qs and by the triangle on units no longer supplied; show quantity supplied falling to Qs.
Reverse and related
Removing the cap → rents rise, producer surplus recovers and landlords supply more homes.