In this work we use data on response times from a public good experiment to test the hypothesis that cooperation is instinctive, under the assumption that the longer the time of the decision, the less instinctive the choice. Results seem to support the hypothesis that cooperation is instinctive, while defection is 'rational'. Moreover, as the experiment is designed also to assess the effects of the consumption of relational goods on cooperation, we are also able to state that some types of relational goods, like team working, produce additional cooperation, but make it less spontaneous. We also detect that males seem to behave more instinctively than females.

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This paper shows the results of an experiment aiming to test the effect of taxation on the labour supply. Differently from previous experiments [Lévy-Garboua, L., Masclet

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