In the figure below, we described how a policymaker representing a uniform group of identical citizens chooses the optimal amount of abatement.

100 Quality of the environment, E The ideal policymaker's indifference curves Slope: MRS X E* 62 B Feasible set Feasible frontier Slope: MRT E with zero abatement 450 500 Abatement costs = 650 billion Consumption of goods and services (billions E)