From a purely theoretical perspective, there is no reason to expect that different levels of contributions in public goods games are associated with the same sanctioning/rewarding rule. The efficiency of a norm should be independent of its enactment procedure. On the contrary, multidisciplinary...

External validity is the problem of generalizing results from laboratory to non-laboratory conditions. In this paper we review various ways in which the problem can be tackled, depending on the kind of experiment one is doing. Using a concrete example, we highlight in particular the distinction...

When the phenomenon of tax evasion is discussed, both scholars and authorities agree on the fact that, although essential, classical enforcements are not enough to ensure tax compliance: some other forms of incentives must be adopted. The paper’s aim is to experimentally test the role of...

Group membership is a powerful determinant of social behaviour in a variety of experimental games. Its effect may be channelled primarily via the beliefs of group members, or directly change their social preferences. We report an experiment with a prisoner's dilemma with multiple actions, in...