We develop a model of electoral competition in which citizens choose whether or not to run as candidates. A winner implements her favorite policy. The equilibrium number of candidates depends negatively on the cost of running and positively on the benefits of winning. For some parameter values all equilibria under plurality rule have exactly two candidates, whose positions are distinct. Twocandidate elections are more likely under plurality rule than under a runoff system (cf. Duverger's Law). The candidates' positions are less differentiated under a runoff system. There exist equilibria under both systems in which some candidates have no chance of winning.

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This paper derives the decision to found a nonprofit firm as the equilibrium outcome of a multistage game among individuals who would like a public good to be provided. The model predicts that if individuals will voluntarily contribute towards provision of the public good, then it is in the self‐interest of the entrepreneur to impose a nondistribution constraint on herself by founding a nonprofit firm.