In the long run, assuming that the owner of a firm in a competitive industry has positive opportunity costs, she a. should exit the industry unless her economic profits are positive. b. will earn zero accounting profits but positive economic profits. c. will earn zero economic profits but positive accounting profits. d. should ignore opportunity costs because they are a type of sunk cost that disappears in the long run

 c. will earn zero economic profits but positive accounting profits.

Explanation:

In a competitive industry, there are many buyers and sellers of homogenous goods and services. There are also low barriers to entry and exit of firms. In the short run, if a firm is earning economic profit, new firms enter into the industry and drive economic profit to zero. Thus, in the long run, a firm only earns accounting profit.

Accounting profit is total revenue less total cost or explicit cost.

Economic profit is accounting profit less implicit cost or opportunity cost.

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answer; the above statement/question is ( true);