Which one of the following statements for a firm’s equilibrium in Perfect Competition is not correct?

  1. A. The market price must be greater or equal to average variable cost in the short run.
  2. B. The market price must be equal to marginal cost.
  3. C. The market price must be equal to average cost in the long run.
  4. D. The marginal cost decreases at the equilibrium output.

Correct Answer: D. The marginal cost decreases at the equilibrium output.

Explanation

At equilibrium output in perfect competition, the marginal cost curve must be increasing, not decreasing.

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