⬇️ Price Ceilings (Maximum Prices)
Definition: A price ceiling prevents the market price from rising above a set level.
How it works
- The ceiling must be set BELOW the equilibrium price to have any effect
- At the lower price: Qd > Qs → SHORTAGE (excess demand)
- Consumers want to buy more, but producers supply less at the lower price
Consequences
- Shortages and queues (not everyone gets the good)
- Need for rationing systems (first-come-first-served, coupons)
- Black markets may develop (people sell at illegal higher prices)
- Reduced quality (producers cut costs to survive at the lower price)
- Reduced supply in the long run (firms exit the market)
Rent controls are the most common price ceiling example. They keep rents low for existing tenants but can lead to housing shortages, reduced maintenance, and long waiting lists — as seen in cities like Stockholm and New York.
⬆️ Price Floors (Minimum Prices)
Definition: A price floor prevents the market price from falling below a set level.
How it works
- The floor must be set ABOVE the equilibrium price to have any effect
- At the higher price: Qs > Qd → SURPLUS (excess supply)
- Producers make more, but consumers buy less at the higher price
Consequences
- Surpluses (unsold goods or unemployed workers)
- Government may have to buy the surplus (costly for taxpayers)
- Higher prices for consumers
- Inefficient producers are kept in business
- May encourage overproduction
Minimum wages and agricultural price supports are both price floors. A minimum wage above equilibrium can cause unemployment (surplus of labour). The EU's Common Agricultural Policy is a price floor that creates food surpluses — a classic exam example.
Know your predicted grade
Take timed mock exams and get detailed feedback on every answer. See exactly where you're losing marks.
Try Mock Exams Free7-day free trial • No card required
⚖️ Evaluating Price Controls
Both create deadweight loss
Any price that is NOT the equilibrium price causes a deadweight loss — some transactions that would benefit both buyer and seller do not happen.
- Price ceiling → fewer units traded than equilibrium → DWL
- Price floor → fewer units traded than equilibrium → DWL
- Both reduce allocative efficiency
Evaluation framework
- Who gains? Ceilings help some consumers; floors help some producers
- Who loses? Ceilings hurt producers and excluded consumers; floors hurt consumers and excluded producers
- Long run vs short run? Short-run benefits often turn into long-run problems
- Are there better alternatives? Subsidies, vouchers, or income transfers may be more efficient
In Paper 1 essays, always evaluate: (1) effectiveness (does it achieve the goal?), (2) efficiency (deadweight loss?), (3) equity (who gains, who loses?), (4) alternatives (is there a better policy?).