7. LO 3 Suppose that, in the basic one-period model, there is no government spending and no taxes. Production by the representative irm produces pollution in proportion to the amount of output produced. Given any consumption bundle (a consumption–leisure pair), the consumer is worse of the more pollution there is.

(a) In a diagram, show the competitive equilibrium and the Pareto optimum. Show that the competitive equilibrium is not Pareto optimal, and explain why. Is more or less output produced in the competitive equilibrium than at the Pareto optimum? Explain.

(b) Now, suppose that the government imposes a proportional tax t on the output of the irm, and rebates the proceeds of the tax in a lump-sum fashion, as a transfer TR to the representative consumer. Show that the tax can be set in such a way that the competitive equilibrium is Pareto optimal. Explain your results.