1.  How does the marginal social benefit curve of a common resource compare to the marginal social benefit curve of positive externality from a mixed good? Highlight the differences through graphs.

2.  a. Suppose the demand for saline solution is perfectly inelastic for contact lens wearers. If the government imposes a tax on saline solution, what occurs? Be sure to tell what happens to the price paid by the buyers and discuss the incidence of the tax.

b. If income tax rates on labor income are decreased, what is the effect on the labor supply and the labor supply curve? What is the effect on the equilibrium quantity of labor hired?