試題詳解

27. Which of the following statements is correct?
(A) In the short-run model the amount of some factor is fixed, while in the long-run model the amount of this factor can vary.
(B) Labor-saving technological progress raises unemployment in both the short and long run.
(C) Firms are more likely to enter the market when the markup is low.
(D) The markup is independent of the number of firms.