NO.PZ2016010802000051
问题如下：
A firm is operating beyond minimum efficient scale in a perfectly competitive industry. To maintain long-term viability the most likely course of action for the firm is to:
选项：
A.
operate at the current level of production.
B.
increase its level of production to gain economies of scale.
C.
decrease its level of production to the minimum point on the long-run average total cost curve.
解释：
C is correct.
The firm operating at greater than long-run efficient scale is subject to diseconomies of scale. It should plan to decrease its level of production.
考点：规模不经济
解析：有效生产规模是长期平均总成本线上的最低点。该点左边的区域被称作规模经济。现在生产规模超过了超过了它，那就再退回来，减少产量。
麻烦解释一下为什么选C
