Fehr, Ernst; Gaechter, Simon - EconWPA - 2003
show experimentally that the altruistic punishment of defectors is a key motive for the explanation of cooperation …. Altruistic punishment means that individuals punish, although the punishment is costly for them and yields no material gain. We … show that cooperation ¯ourishes if altruistic punishment is possible, and breaks down if it is ruled out. The evidence …