Perfect competition achieves efficiency if _.
A. there are no external benefits and no external costs
B. producer surplus equals zero
C. consumer surplus is greater than producer sur-plus
D. marginal benefit is greater than marginal cost
Answer:A
Perfect competition achieves efficiency if _.
A. there are no external benefits and no external costs B. producer surplus equals zero C. consumer surplus is greater than producer sur-plus D. marginal benefit is greater than marginal cost