An infectious disease can only be eradicated globally if it is eliminated in every country. But does this require only international coordination, or does it require cooperation? Using a model that blends epidemiology, economics, and game theory, this paper shows that coordination will not...

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...