The play of a game is a public good because it is "consumed" by each of the players. We model the play as supplied by an organizer managing a team--the demanders of the public good whose actions are unobservable. Competition among organizers leads to a price-quantity description of efficient...

We show that efficient anonymous incentive compatible (dominant strategy) mechanisms for public goods eliminate externalities, i.e., each individual is unable to change the welfare of anyone else. The characterization is used to derive existence and non-existence results for models with a finite...