conditionally cooperative preferences. Cooperation generated by this type of preferences is notoriously unstable, as individuals …-shared conclusion that cooperation observed in experiments (and its collapse) is mostly driven by imperfect reciprocity. In this study … fraction of reciprocally cooperative subjects become selfish in the course of the experiment, while the reverse is rarely …

Why does human cooperation often unravel in economic experiments despite a promising start? Previous studies have … cooperation). This interpretation has been considered evidence of a uniquely human form of cooperation, motivated by altruistic … both confounds explanations based on conditional cooperation with explanations based on individuals learning how to better …