题目内容

[单选]A sunk cost is one that

A. changes as the level of output changes in the short run.
B. was paid in the past and will not change regardless of the present decision.
C. should determine the rational course of action in the future.
D. has the most impact on profit-making decisions.

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[单选]Tommy's Tires operates in a perfectly competitive market. If tires sell for $50 each and average total cost per tire is $40 at the profit-maximizing output level, then in the long run

A. more firms will enter the market.
B. some firms will exit from the market.
C. the equilibrium price per tire will rise.
D. average total costs will fall.

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[单选]In the long-run equilibrium of a market with free entry and exit, marginal firms are operating

A. at the point where average variable cost equals marginal cost.
B. at the minimum point on their marginal cost curves.
C. at their efficient scale.
D. where accounting profit is zero.

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[判断]For a firm operating in a perfectly competitive industry, total revenue, marginal revenue, and average revenue are all equal.

A. 对
B. 错

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[判断]Because there are many buyers and sellers in a perfectly competitive market, no one seller can influence the market price.

A. 对
B. 错

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[单选]A sunk cost is one that

A. changes as the level of output changes in the short run. B. was paid in the past and will not change regardless of the present decision. C. should determine the rational course of action in the future. D. has the most impact on profit-making decisions.

[单选]Tommy's Tires operates in a perfectly competitive market. If tires sell for $50 each and average total cost per tire is $40 at the profit-maximizing output level, then in the long run

[单选]In the long-run equilibrium of a market with free entry and exit, marginal firms are operating

[判断]For a firm operating in a perfectly competitive industry, total revenue, marginal revenue, and average revenue are all equal.

[判断]Because there are many buyers and sellers in a perfectly competitive market, no one seller can influence the market price.

A. changes as the level of output changes in the short run.
B. was paid in the past and will not change regardless of the present decision.
C. should determine the rational course of action in the future.
D. has the most impact on profit-making decisions.