Draw a graph with "miles driven" on the horizontal axis and "$ per mile "on the vertical axis. Draw curves to represent the marginal social cost, the marginal private cost, and the marginal benefit of driving. Label the socially optimal quantity Qs and the quantity drivers will actually choose Qp. Show how the graph would change as the result of a new, cleaner- burning fuel. Between the solutions suggested by Pigou, Hardin, and Coase, which one is most likely to be successful in this context? Why?