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。
minimum前面没有cost，但是就是imply这个意思吧
