IB Economics Unit 2.6: Microeconomics - Market Power (id: 9f18742a2)

本题目来源于试卷: IB Economics Unit 2.6: Microeconomics - Market Power，类别为 IB经济学

[单选题]

The diagram above shows a typical firm in a perfectly competitive market. Which of the following statements is true?

A. $Q_2$is the profit maximising level of output.
B. Firms will exit the market.
C. Firms will enter the market.
D. The market is in long-run equilibrium.


参考答案:  B


本题详细解析:

B

imageThis diagram depicts a perfectly competitive firm making a loss (AC > AR). As there are no barriers to exit, firms will leave the industry. This will continue until the AR curve shifts up and is tangent with the AC curve at its minimum point (Q${}_2$).

Choice A is incorrect because the profit-maximising level of outputis Q${}_1$ (where MC = MR).

Choice C is incorrect because firms would not enter an industry where every firm is making a loss.

Choice D is incorrect as perfectly competitive firms will make normal profit (not losses) in the long run

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