A Socially Efficient Quantity of a Good Is Said to Be

Multiple Choice

A socially efficient quantity of a good is said to be produced,if at that output level:

A) the marginal external cost equals the marginal social benefit.
B) the private marginal cost equals the marginal social benefit.
C) the marginal private costs are equal to external costs.
D) the difference between the private marginal cost and social marginal benefit is maximized.