问题
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.
答案
参考答案：C
解析：
The short-run market supply curve is the horizontal sum of the marginal cost curves for all firms in a given industry. It is the sum of all quantities from all firms at each price along each firm’s marginal cost curve.