单项选择题

Under perfect competition, the short-run market supply curve is most accurately described by which of the following statements The market short-run supply curve is the:

A. average of the quantities at each price along the marginal cost curve for all firms in a given industry.
B. sum of the quantities at each price along the average total cost curve for all firms in a given industry.
C. sum of the quantities at each price along the marginal cost curves for all firms in a given industry.

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单项选择题When individuals are unemployed because they do not have perfect information concerning available jobs, this is:

A. frictional unemployment.
B. structural unemployment.
C. cyclical unemployment.

单项选择题In the short run, if price is below average total cost (ATC), the firm will:

A. keep running as long as it is covering its variable costs.
B. produce more.
C. raise prices.