, the less likely cooperation will be. …

We consider the possibility that cooperation in a prisoner's dilemma is fostered by people's voluntarily enhancement of … cooperate when either one of these mechanisms is allowed. In agreement with theory, subjects aiming for cooperation choose … higher vulnerability levels in Gradual than in Leap, which maps into higher mutual cooperation levels. …

encourage cooperation may actually hurt morale, by convincing opportunistic team members to imitate and later take advantage of …

. Cooperation in such games can be sustained as a Nash equilibrium. Besides the efficient cooperative equilibrium there is also the … inefficient non-cooperative equilibrium. This paper investigates experimentally whether cooperation actually occurs in a simple …

behavior. I show that for a large class of parameters cooperation will emerge if the population is large; if the population is … population, the less likely cooperation will be. <BR><BR> …

In this paper we argue that authorities aid cooperation by means of direct coordination or the enforcement of re …-commitment devices such as contract laws.Credible threats of violence allow this role. In a local interaction model, an authority forms …

in the final periods. We interpret subjects' behavior in terms of conditional cooperation which is characterized by both …

uncooperative actions. They play a key role by subduing the desire of punished individuals to retaliate and by motivating them to …

can increase the cooperation level of individuals in the group. …