We study cooperation within and between groups in the laboratory, comparing treatments in which two groups have … conflict. We model conflict using an inter-group Tullock contest, and measure its effects upon cooperation using a multi …-level public good game. We demonstrate that conflict increases cooperation within groups, while decreasing cooperation between …

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 …

An effective way to foster cooperation is to monitor behaviour and sanction freeriding. Yet, previous studies have … shown that cooperation quickly declines when sanctioning mechanisms are removed. We test if explicitly expressing trust in … players' capability to maintain cooperation after the removal of sanctions, i.e. vertical communication of trust, has the …

opportunity for profitable cooperation. Our experimental method creates two groups of subjects who are similar but have different … long-run losses. Initially similar, cooperation rates for groups with different intelligence levels diverge, declining in … groups of lower intelligence, and increasing to reach almost full cooperation levels in groups of higher intelligence …

initial cooperation rates are similar, it increases in the groups with higher intelligence to reach almost full cooperation … differences in the response to past cooperation of the partner. In higher intelligence subjects, cooperation after the initial … difference is absent. Cooperation of higher intelligence subjects is payoff sensitive, thus not automatic: in a treatment with …

hampers cooperation, as higher intelligence players are less cooperative once they are made aware that they play against … disrupts coordination on outcomes with positive payoffs, as higher intelligence players try to force their most preferred …. Disclosure does not significantly affect coordination rates. Differently from the low payoff inequality game, coordination is …

BoS, with high and low payoff inequality. In PD, disclosure markedly hampers cooperation, as higher intelligence players … with low payoff inequality, disclosure disrupts coordination, as higher intelligence players try to force their most … does not significantly affect coordination, while coordination is more often on outcomes that favor the less intelligent …

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 …

artificial intelligence may or may not be cooperative. We study the deter-minants and forms of algorithmic cooperation in the … prisoner’s dilemma games played by humans in the lab. We find that the same factors that increase human cooperation largely … also determine the cooperation rates of algorithms. However, algorithms tend to play different strategies than humans …

A growing experimental literature studies the endogenous choice of institutions to solve cooperation problems arising … of institutional choice. Almost all institutions improve cooperation if they are implemented, but they are not always … identified as important determinants of institutional choice. Cooperation tends to be higher under endogenously chosen …