问题如下：
Under the perfect competition, a firm aims to maintain at the optimal size. What will the firm most likely do when it operates less than minimum effecient scale?
选项：
A.Stay at the current level of production.
B.Decrease its level of production.
C.Increase its level of production.
解释：
C is correct.
The minimum effecient scale is the optimal firm size under perfect competition over the long run. The firm is currently operating less than minimum effecient scale, therefore it should increase production level and reach the constant returns to scale.
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。现在生产规模没有到达该点，那就应该增加产量。
optimal size是什么意思呀
