Principles of Microeconomics / Unit 2 MIC 0141 review, 2 to 3 minutes
Why a Binding Ceiling Can Leave Buyers Worse Off
The idea
A price ceiling is passed to help buyers, and the diagram shows why it can fail them as a group. Set below equilibrium, it lowers the price for the buyers who still get the good, which is the visible gain. Three things then follow. The quantity supplied falls, because sellers offer less at a lower price, so fewer buyers get anything. A shortage rations by something other than price, so the good goes to whoever waits longest, knows the seller, or pays through the back door, and the back-door payment can push the true price above the old equilibrium for some buyers. And quality erodes, because a seller who cannot raise the price can still cut what the price buys. The surplus accounting makes the result exact. The buyers who keep the good gain a rectangle transferred from sellers. The buyers who lose the good lose a triangle of surplus, and so do the sellers of those units. That pair of triangles is the deadweight loss, and it is why buyers' total gain is smaller than sellers' total loss. Over time the supply response grows: units are converted, neglected or withdrawn, the shortage widens, and the transfer shrinks while the loss grows.
In practice
Worked example: a city's rental market clears at twelve hundred dollars a month with twenty thousand units let. A ceiling of nine hundred dollars cuts the units offered to sixteen thousand, while twenty-four thousand households now want one. Sixteen thousand tenants pay three hundred less, a transfer of four million eight hundred thousand dollars a month from landlords. Four thousand households that would have rented at twelve hundred find nothing. Some of them offer key money to jump the queue, and a household paying a four-thousand-dollar key fee on a one-year lease is paying more than the old rent. Landlords defer repairs. Ten years on, conversions have taken the offered units to thirteen thousand, and the shortage has grown from eight thousand to eleven thousand households.
Where people slip
Three cautions. The visible gain is real: sitting tenants do pay less, which is why the control is popular with them. The invisible losers are the people who never find a unit, and they are exactly the newcomers the policy was meant to help. And the comparison that matters is not the controlled rent against the old rent, but the whole set of buyers before against the whole set after, which the surplus triangles are drawn to count. None of this says a ceiling is always wrong; a society may accept the loss for the transfer. It says the loss must be counted.
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