Q.

When a perfectly competitive industry is in long-run equilibrium, all firms in the industry

A. earn zero economic profits
B. produce a level of output where short-run marginal cost is equal to short-run average total cost
C. produce a level of output where long-run marginal cost is equal to long-run average cost
D. All of the above are correct
Answer» D. All of the above are correct
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Micro economics 2

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