单项选择题

In perfectly competitive constant-cost industries and perfectly competitive increasing-cost industries, respectively, what is the most likely long-run effect of a permanent increase in demand ncreasing-cost industry Constant-cost industry（）①A. price decreases price decreases ②B. price decreases price remains unchanged ③C. price remains unchanged price decreases

A. ①
B. ②
C. ③

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单项选择题
The quantity of labor that a profit maximizing firm will employ, holding other input factors constant, is the level at which:（）

A. the marginal revenue product of labor is equal to the wage rate.
B. the marginal product of labor is equal to the marginal cost of labor.
C. one more unit of labor would cost less than the value of its additional output.
单项选择题
Which of the following is least likely to be considered a reason why regulation of monopolies is not effective（）

A. Regulators do not know the firm’s cost structure.
B. Regulation shifts industry demand and increases prices.
C. Regulation reduces the incentive for firms to reduce costs.
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