中等econ-u04-d04
The marginal cost curve intersects the AVC and ATC curves:
A. At their minimum points✓ 答案
B. At their maximum points
C. Only at the vertical intercept
D. Where AVC and ATC cross each other
解說
When marginal cost is below an average, the average is pulled down; when it is above, the average is pulled up. The average is therefore lowest exactly where the marginal curve cuts it.