Economic efficiency is
A. a market outcome in which the marginal benefit to consumers of the last unit produced is equal to its marginal cost of production and in which the sum of consumer surplus and producer surplus is at a maximum.
B. a market outcome in which the marginal benefit to consumers of the last unit produced is greater than its marginal cost of production and in which the sum of consumer surplus and producer surplus is at a maximum.
C. a market outcome in which the marginal benefit to consumers of the last unit produced is equal to its marginal cost of production and in which the sum of consumer surplus and producer surplus is not at a maximum.
D. a government outcome in which the marginal benefit to consumers of the last unit produced is equal to its marginal cost of production and in which the sum of consumer surplus and producer surplus is at a maximum.