Starting with Vickrey (1945) and Mirrlees (1971), the optimal tax literature has studied the design of a personal income tax. The assumed ideal would be to tax earnings ability. Earnings ability is unobservable for tax purposes, however. Past papers have focused instead on designing a tax on...

Though the traditional literature in fiscal federalism argues that the Federal government should have primary responsibility for income redistribution, U.S. states are in fact actively engaged in redistribution. This paper develops a positive model of the respective roles of state and Federal...