基礎ECON-MSTR-015
A price-taking firm in perfect competition faces a demand curve for its own output that is:
A. Perfectly elastic at the market price.✓ 答案
B. The market demand curve.
C. Downward sloping and equal to marginal revenue only at the midpoint.
D. Vertical, because the firm must sell a fixed quantity.
解說
The market demand can slope down, but one firm is too small to affect price. Its own demand is a horizontal line at the market price, so P = MR = AR. It is not forced to a fixed quantity.