(i) risk best explains the variation in cooperation rates across random matching ("stranger'') and one-shot treatments … cooperation in partner than stranger if and only if risk is high and temptation low and (v) women are more cooperative than the … understand which dimension of the dilemma (risk or temptation) is best targeted via interventions to yield improved cooperation …

We present a natural environment that sustains full cooperation in one-shot social dilemmas among a finite number of … emerge in equilibrium. The same environment leads to full cooperation in the prisoners' dilemma …

find support for risk dominance of TFT as a determinant of cooperation. This comment introduces the "Payback" strategy … explain the observed cooperation patterns. …

We study the effect of environmental risk on cooperation in the Voluntary Contribution Mechanism. Our baseline is the … this happens independently for each group member. Our main result is that risk does not harm cooperation either in the one … robust and conservative measure of human cooperation …

We examine the effect of payoff variations on cooperation in one-shot prisoner's dilemma games. We focus on three … impact on cooperation. Temptation directly deters cooperation and indirectly harms cooperation by lowering beliefs about the … opponent's cooperativeness. Efficiency indirectly affects cooperation through beliefs, but the magnitude of the effect is …