Three is a crowd in iterated prisoner's dilemmas: experimental evidence on reciprocal behavior.

Based on the Table 2 , we have size, LagCoop and LagAction as highly significant covariates at 1% significance level).

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However, as the game continues in our experiment, we observe a clear trend towards increasing cooperation, punctuated by episodes of lower cooperation levels which are rapidly overcome.

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Pairwise interactions show very high cooperation levels with an increasing trend (see below for a discussion of similar, earlier results 17 , 18 ) whereas for the rest of groups we find that cooperation decays from initially large values (around 60% or larger) much in the same way as in most Public Goods or networked IPD experiments.

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