post announcement mechanism does not have a significant effect on the cooperation rate. However, the nudge leads to a … striking increase in the cooperation rate. We provide suggestive evidence that the nudge we use provides subjects with a focal … which accurate feedback about contributions is not available. The first intervention aims to exploit lying aversion by …

any independent effect on cooperation in a public good game. The results show that, for given marginal incentives … contributions. Moreover, obligations per se cannot sustain cooperation over time, even if they affect the rate of decline of average … contributions. Finally, unexpected changes in the minimum contribution have asymmetric dynamic effects on the levels of cooperation …

We investigate experimentally whether the extent of conditional cooperation in public good games depends on the … conditional cooperation. We also find no evidence that the type of game makes a difference to unconditional contributions. The …

We experimentally compare the consequences for group cooperation of two decision mechanisms involving the extension of …

We report on an experiment designed to explore whether a written expression of disapproval affects future levels of … cooperation. In between two identical public goods games, participants play a mini dictator game that, depending on the treatment …

This paper provides a new way to identify conditional cooperation in a real-time version of the standard voluntary … further contribution, and use a permutation test on contribution cycles to assign a measure of conditional cooperation to each … group play. The validity of the measures is tested in an experiment. We find that roughly 20% of the plays exhibit dynamics …

cooperation as observed in the lab and ways it can be exploited for fundraising purposes …