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 …

We use an experiment to test the hypothesis that groups consisting of like-minded cooperators are able to cooperate …

interaction impacts cooperation within groups and surplus distribution. We developed and tested experimentally a Surplus … Allocation Game where cooperation of four agents is needed to produce surplus, but only two have the power to allocate it among … distributors and receivers. While behavior at the group level is diverse for surplus allocation and amount of cooperation …

Pledges feature in international climate cooperation since the 2015 Paris Agreement. We explore how differences in … pledgers' trustworthiness affect outcomes in a social dilemma that parallels climate change. In an online experiment, two … the Paris Agreement, can leverage the power of trustworthiness to enhance cooperation. …

We study the stability of voluntary cooperation in response to varying rates at which a group grows. Using a laboratory … cooperation. We then study the effect on cooperation of exogenously varying rates of entry. Slow growth yields higher cooperation … endogenous growth generally also produces high cooperation levels, growth stalls at intermediate group sizes, leaving potential …