问题
单项选择题
A firm operating under perfect competition will experience economic losses when which of the following conditions exists（）
A. Marginal revenue is greater than average total cost.
B. Market price is less than average total cost.
C. Marginal cost = average total cost = marginal revenue = price.
答案
参考答案：B
解析：
Under perfect competition, a firm will experience economic losses when its selling price is less than average total cost.