We show that simple majority rule satisfies five standard and attractive axioms-the Pareto property, anonymity, neutrality, independence of irrelevant alternatives, and (generic) decisiveness-over a larger class of preference domains than (essentially) any other voting rule. Hence, in this...

These original essays focus on a wide range of topics related to Frank Hahn's distinguished work in economics. Ranging from market analysis and game theory to the microeconomic foundations of macroeconomics and from equilibrium and optimality with missing markets to economics and society, they...

We exhibit an efficient auction (an auction that maximizes surplus conditional on all available information). For private values, the Vickrey auction (for one good) or its Groves-Clarke extension (for multiple goods) is efficient. We show that the Vickrey and Groves-Clarke auctions can be...