Endogenous group formation and responsibility diffusion: An experimental study
通过实验研究个体关键性和内生群体进入如何影响群体决策的自私性，发现外生群体中存在责任扩散但随重复减弱，内生群体形成则放大关键性变化的效果。
We study the effects of varying individual pivotality and endogenous group entry on the selfishness of group decisions. Selfish choices by groups are often linked to the possibility of diffusing responsibility; the moral costs of these decisions appear smaller when individual pivotality is reduced. Our experimental design explores unanimity voting under distinct defaults to identify this effect. In exogenously formed groups we find evidence of responsibility diffusion, but this diminishes with repetition. Our results also demonstrate the role of self-selection in generating differences in group behaviour depending on individual pivotality. Driven by a heterogeneous selection pattern, endogenous group formation amplifies the effects of a change in pivotality. Some people actively seek an environment to diffuse responsibility, while others join groups to promote pro-social behaviour.