We investigate the role of endowment inequality in a local and global public goods setting with multiple group membership and examine the effect of temporal role reversal on cooperation decisions. Subjects can contribute to a global public good which benefits all subjects and two local public goods which benefit only subjects of either their own group or the group of the other endowment type. Endowment inequality per-se decreases contributions of subjects with a high endowment to the global public good, but increases cooperation of subjects with a low endowment on their local public good, thereby aggravating income disparities. Exogenously induced role reversal for several periods affects cooperation behavior of subjects with a high endowment positively and induces them to contribute more to the global good. Cooperation in unequal environments thus appears to be more stable when all parties have experienced the public goods game from the disadvantageous perspective.

我们调查了禀赋不平等在具有多个群体成员的地方和全球公共产品环境中的作用，并研究了时间角色逆转对合作决策的影响。主体可以为使所有主体受益的全球公共产品和仅使他们自己的群体或其他禀赋类型的群体受益的两个地方公共产品做出贡献。禀赋不平等本身降低了高禀赋主体对全球公共产品的贡献，但增加了低禀赋主体对当地公共产品的合作，从而加剧了收入差距。几个时期的外生诱导角色反转对高禀赋主体的合作行为产生积极影响，并诱导他们为全球利益做出更多贡献。