Many positive externalities are created by individual risk-taking. We investigate whether risk-taking increases in the presence of positive externalities. In our experiments, we study choices between investments in technologies that differ according to their level of risk and the extent to which...

The voluntary provision of a pure public good is studied in the presence of an anonymous external donor. New data generated using experimental procedures employing both extra-credit and cash incentives, as well as asynchronous access to real-time decision rounds lasting several days, are...

We examine behavior in one-shot appropriation games with deterministic and probabilistic degradation externalities, where the marginal net benefit from appropriation is endogenous, dependent on individuals' expectations of group appropriation. The experimental design involves a menu of games...