We study the effect of group size on cooperation in voluntary contribution mechanism games. As in previous experiments … find that cooperation is highest of all in twoperson groups. The findings in the high MPCR condition are consistent with … those from n-person prisoner's dilemma and oligopoly experiments that suggest it is more difficult to sustain cooperation in …

can promote cooperation through a combination of sorting and opportunistic signaling, with late period defections by … remains unclear. In each of six treatments that vary the cooperation premium and the informational basis for reputation …, that with a high cooperation premium and good information, investment in reputation grows across sets of finitely …

We use experimental methods to investigate whether pledges of commitment can improve cooperation in endogenously … findings show that pledges of commitment alone can increase cooperation and welfare in committed partnerships. The introduction … partnerships fall solely on the individual choosing to break up, pledges of commitment fail to improve cooperation and welfare. …