Final answer:
Allocative efficiency refers to producing the optimal quantity of a good where the marginal benefit to society equals the marginal cost.
Step-by-step explanation:
Allocative efficiency is an economic concept that refers to producing the optimal quantity of a good where the marginal benefit to society of one more unit equals the marginal cost. In a perfectly competitive market, firms maximize their profits by producing at the quantity where price is equal to marginal cost, ensuring that the social benefits of producing the good align with the social costs of production.