An analyst does research about long-run eq
题型：单项选择题
问题：
An analyst does research about long-run equilibrium in monopoly markets. With respect to the regulation of a natural monopoly, a govemment subsidies sufficient to compensate the natural monopoly firm implies setting:
A. price equal to average cost.
B. price equal to marginal cost.
C. output where marginal cost equals marginal revenue.