Question

Which of the following statements is (are) TRUE?

I. Free entry to a perfectly competitive industry results in the industry's firms earning zero economic profit in the long run, except for the most efficient producers, who may earn economic rent.
II. In a perfectly competitive market, long-run equilibrium is characterized by LMC < P < LATC.
III. If a competitive industry is in long-run equilibrium, a decrease in demand causes firms to earn negative profit because the market price will fall below average total cost.

Answer 1

III. If a competitive industry is in long-run equilibrium, a decrease in demand causes firms to earn negative profit because the market price will fall below average total cost.

Step-by-step explanation:

A perfect competition is characterised by many buyers who sell homogenous products.

All firms in a perfect competition earn zero economic profit in the long run because there are no barriers to entry or exit.

In the long run, equilibrium occurs at: P = LMC = LATC

If demand falls, prices would fall below average total cost and the firm would earn negative profit .