AP微观经济学市场结构学的练习题（2）

　　为了方便同学们的AP备考，考试网小编为大家收集整理了AP微观经济学市场结构学的练习题，供大家学习参考，希望能为同学们的考试提供帮助。

　　6. Within the range of market demand, which of the following is consistent with the conditions? of a natural monopoly? (2012, 第21题，AP微观, Answer: C)

　　(A) Long-run total cost decreases as output increases.

　　(B) Long-run average total cost remains constant as output increases.

　　(C) Long-run average total cost decreases as output increases.

　　(D) Marginal cost exceeds average cost.

　　(E) Setting price equal to marginal cost will maximize profits.

　　7. A constant-cost, perfectly competitive gadget industry is in long-run equilibrium. An increase in the number of consumers of gadgets will most likely result in (2012,第23题，AP微观, Answer: D)

　　(A) higher short-run and long-run prices for gadgets

　　(B) reduced short-run profits, followed by the exit of some firms

　　(C) an upward shift in all short-run cost curves, followed by a higher long-run price for gadgets

　　(D) a higher short-run price for gadgets, followed by an increase in the quantity produced

　　(E) a decrease in the demand for gadgets, followed by a decrease in the supply of gadgets

　　8. The profit-maximizing firm depicted in the graph above should (2012,第24题，AP微观, Answer: A)

　　(A) exit if conditions do not improve in the long run

　　(B) produce the output that minimizes average total cost

　　(C) increase price to maximize profits

　　(D) increase output to maximize profits

　　(E) use less capital and more labor to reduce cost

　　9. The graph above shows the short-run cost curves of a firm in a perfectly competitive market. Which of the following are true at the firm’s profit maximizing output level? (2012,第38题， AP微观, Answer: C)

　　I. Price exceeds average total cost.

　　II. Economic profits are zero.

　　III. Marginal cost equals average total cost.

　　IV. New firms are likely to enter the market in the long run.

　　(A) I and II only

　　(B) I and III only

　　(C) I and IV only

　　(D) II, III, and IV only

　　(E) I, II, III, and IV

　　10. Which of the following best describes an oligopolistic market? (2012,第39题， AP微观, Answer: C)

　　(A) Many sellers with identical products and no barriers to entry

　　(B) Many sellers, each with a clearly differentiated product, and no barriers to Entry

　　(C) A few competing sellers with similar products and high barriers to entry

　　(D) A few competing sellers of identical products and no barriers to entry

　　(E) No competition among sellers and high barriers to entry

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