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...

Although fairness concerns may be relevant, they appear to be too simple an explanation for why game theory's strong predictions for ultimatum games are so rarely supported. Self interested offerers want to avoid rejections; unpredicted, non-equilibrium behavior is more valuable and effective...