Nash oligarchies
提出纳什寡头解的概念，即存在一个寡头群体，群体外成员只能得到分歧收益，寡头之间按纳什解分配剩余。通过公理刻画，证明该解等价于满足三个标准公理及一个平衡功利与平等条件的解。
A bargaining solution is a Nash oligarchy if there exists a set of players O , the oligarchy, such that in every bargaining problem every player outside O is allocated his disagreement payoff, and the oligarchs share the surplus according to the | O | -person Nash solution. The Nash bargaining solution corresponds to the case where O contains all players, and dictatorial solutions correspond to singleton O s. I show that a solution satisfies three standard axioms together with a condition that balances utilitarianism and egalitarianism if and only if it is a Nash oligarchy. Strengthening the condition implies that the oligarchy contains at most two players. Strengthening it further implies a dictatorship.