Suppose that the market for haircuts in a community is perfectly competitive and that
the market is initially in long-run equilibrium. Subsequently, an increase in population
increases the demand for haircuts. In the short run, the typical firm is likely to:
A) earn an economic profit.
B) incur an economic loss.
C) have no change in its economic profit.
D) have neither an economic profit nor an economic loss.
Zoe’s grandparents are excited about finally paying off their mortgage, because, as they
say, “Our cost of housing is now zero.” Zoe should explain to them the economic
principle of:
A) marginal analysis: if the additional cost of housing is zero, then their additional
benefit is also zero.
B) opportunity cost: by living in the house, they are giving up the opportunity to sell the
house, buy a smaller one, and pocket the difference.
C) efficiency: If their cost of housing is now zero, they should let Zoe move in without
charging her any rent. Zoe is better off, and her grandparents aren’t hurt.
D) equity: it is unfair that some people are still paying off their mortgage.