Which of the following statements is true for both a monopolistically competitive firm and a perfectly competitive firm in long-run profit-maximizing equilibrium?单项选择题

A

Economic profits equal zero, and marginal revenue equals marginal cost.

B

Economic profits equal zero, and price equals marginal cost.

C

Economic profits equal zero, and price exceeds marginal cost.

D

Economic profits equal zero, and price equals marginal revenue.

E

Marginal revenue equals marginal cost, and profits are positive.

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