Several of the results reported here broadly support theories of sequential equilibria. In particular, at least four pieces of data indicate that game theory's structurally-oriented models predict some of the reasons for individuals' play in the prisoner's dilemma game: (1) more cooperation...

Previous research demonstrates that individuals vary in their social preferences. Less well-understood is how group composition affects the behavior of different social preference types. Does one bad apple really spoil the bunch? This paper exogenously identifies experimental participants’...