题目
题目
单项选择题

5.    The main difference between the short run and the long run is that: A.    firms earn zero profits in the long run. B.    the long run always refers to a time period of one year or longer. C.    in the long run, only one variable can be fixed. D.    in the short run, one or more inputs is fixed.

选项
A.A
B.B
C.C
D.D
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标准答案
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思路分析
In analyzing the difference between the short run and the long run, we need to clarify what can be varied in each time frame. Option A: 'firms earn zero profits in the long run.' This is not a universal truth. In many models, firms can earn positive profits in the long run, especially if there are barriers to......Login to view full explanation

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