We study a multilateral negotiation procedure that allows for "partial agreements" in which responders are told only their own shares. Applications of our model include negotiations under "joint and several liability." Unlike previous models of multilateral bargaining with exit, we find that...

We study trading models when the distribution of signals such as costs or values is not known to traders or the mechanism designer when the profit-maximizing trading procedure is designed. We present adaptive mechanisms that simultaneously elicit this information (market research) while...

We offer a theory of polarization as an optimal response to ambiguity. Suppose individual A's beliefs first-order stochastically dominate individual B's. They observe a common signal. They exhibit polarization if A's posterior dominates her prior and B's prior dominates her posterior. Given...

Two players choose hawkish or dovish actions in a conflict game with incomplete information. An "extremist," who can either be a hawk or a dove, attempts to manipulate decision making. If actions are strategic complements, a hawkish extremist increases the likelihood of conflict, and reduces...

Two players simultaneously decide whether or not to acquire new weapons in an arms race game. Each player's type determines his propensity to arm. Types are private information, and are independently drawn from a continuous distribution. With probability close to one, the best outcome for each...