A Multi-Group Public Goods Game Experiment

People belong to many different groups, and few belong to the same network of groups. Moreover, people routinely reduce their involvement in dysfunctional groups while increasing involvement in those they find more attractive. The net effect can be an increase in overall cooperation and the partial isolation of free-riders, even if free-riders are never punished, excluded, or recognized. We test this conjecture with a multi-good extension of the standard finitely repeated public goods game. Our results from four treatments suggest that the multi-group setting indeed raises overall cooperation and dampens the impact of free-riders.