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我觉得答案是 B ,但答案是 C. 为什么? 非常感谢!
Assume that a firm that produces a good in a constant-cost perfectly competitive industry is in long-run equilibrium. If the demand for the good increases, the profit-maximizing output by the firm will change in which of the following ways in the short run and long run?
Short Run | Long Run | |
(A) | Return to original level | Return to original level |
(B) | Increase | Increase |
(C) | Increase | Return to original level |
(D) | Decrease | Decrease |
(E) | Decrease | Return to original level |



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