问题
单项选择题
In a regulated industry, the introduction of a marginal cost pricing role that maximizes total surplus would most likely be viewed as:（）
A. inefficient but leaves the natural monopoly incurring an economic loss.
B. inefficient and allows the natural monopoly to realize an economic gain.
C. efficient but leaves the natural monopoly incurring an economic loss.
答案
参考答案：C
解析：
A marginal cost pricing rule sets price equal to marginal cost. It is efficient but leaves the natural monopoly incurring an economic loss. Because, with an increase in output the average total cost falls, resulting in marginal cost being less than the average cost.