Behind my reciprocation of a friend's gift may lie both instrumental reasons (I expect further future gifts) and communicative reasons (I want to establish or confirm a friendship per se ). In a theory of rational individual action, such communicative reasons can be incorporated as an argument...

We study individual behaviour in a repeated linear public good experiment in which, in each period, subjects are required to contribute a minimum level and face a certain probability to be audited. Audited subjects who contribute less than the minimum level are convicted to pay the difference...

We present results from a multiple public goods experiment, where each public good produces benefits only if total contributions to it reach a minimum threshold. The experiment allows us to compare a subject's behavior in a benchmark treatment with a single public good and in treatments with...