问题
单项选择题
Which of the following is least accurate regarding the relationship between price (P) , marginal revenue (MR) , average total cost (ATC), and marginal cost (MC) at the profit maximizing output under monopoly（）
A. P=MR
B. MR=MC.
C. P＞MＣ.
答案
参考答案：A
解析：
To maximize profit, all firms expand output until marginal revenue equals marginal cost. Price is determined from the demand curve, which is above the marginal revenue curve since a monopoly faces a downward sloping demand curve.