Text S1 - If Cooperation Is Likely Punish Mildly: Insights from Economic Experiments Based on the Snowdrift Game

Additional information supporting the main conclusions of this paper. The document contains instructions that were given to participants of Treatments I, II and III, details of the regression analysis, and additional results on the evolution of the cooperation level, the rate of strategy changes during the economic experiments, and the percentages of strategies that were employed by the participants.
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