If the market for roller blades is at a competitive equilibrium, and there are no external costs or benefits, then
A) marginal social benefit is equal to marginal social cost.
B) the sum of consumer surplus and producer surplus is maximized.
C) resources are being used efficiently.
D) All of the above answers are correct.

Question

Quizplus · Accepted Answer

In a competitive equilibrium without externalities, marginal social benefit equals marginal social cost, maximizing the sum of consumer and producer surplus, indicating efficient resource use.

If the Market for Roller Blades Is at a Competitive