Dynamic Voluntary Contribution to a Public Project

We consider the dynamic private provision of funds to projects that generatepublic benefits. Participants have complete information about theenvironment, but imperfect information about individual actions: each periodthey observe only the aggregate contribution. Each player may contribute anyamount in any period before the contributing horizon is reached. All Nashequilibrium outcomes are characterized. In many cases they are all alsoperfect Bayesian equilibrium outcomes. If the horizon is long, if theplayers' preferences are similar, and if they are patient or the periodlength is short, perfect Bayesian equilibria exist that essentially completethe project. In some of them the completion time shrinks to zero with theperiod length—efficiency is achieved in the limit.