NO.PZ2018062003000047
问题如下：
In a perfectly competitive market, the firm's short-term shutdown point is:
选项：
A.where the average total cost curve intersects with its price level.
B.where the marginal revenue curve intersects with marginal cost curve.
C.where the marginal revenue curve is below or equal to the average variable cost curve.
解释：
C is correct.
When marginal revenue curve is below average variable cost curve, the firm will face a loss. Therefore, it is at the short-term shutdown points.
考点：停止营业点
解析：当边际收益小于平均可变成本时，厂商就应该停止营业。所以应该选C
为什么这题就是和AVC比较，773题却和 ATC 比较。
773题问 的是短期 breakeven point，就要和ATC比较
这题问的是短期 shutdown point，就和AVC比较
短期breakeven point平衡了，低于这个point不是应该shutdown嘛？
