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Dynamic Bargaining and External Stability with Veto Players
This note examines the structure of stationary bargaining equilibria in the nite framework of Anesi (2010). The main result establishes a tight connection between the set of equilibrium absorbing points and the von Neumann-Morgestern solutions: assuming that players are patient, that the voting rule is oligarchical, and that there is at least one veto player with positive recognition probability, a set of alternatives corresponds to the absorbing points of an equilibrium if and only if it is a von Neumann-Morgenstern solution. We also apply our analysis of ergodic properties of equilibria to the persistent agenda setter environment of Diermeier and Fong (2012). We show that all equilibria are essentially pure, and we extend their characterization of absorbing sets to allow an arbitrary voting rule and by removing the restriction to pure strategy equilibira.
Existence and Indeterminacy of Markovian Equilibria in Dynamic Bargaining Games
We show that dynamic bargaining games are characterized by a continuum of stationary Markov perfect equilibria, when the set of alternatives is multidimensional and players are patient. In fact, we show that there is a continuum of equilibria close to any alternative satisfying a simple linear independence condition on the players' gradients. The approach extends the construction of simple solutions from Anesi and Seidmann (2015) to the spatial setting. The implication is that constructive techniques, which involve an explicit specification of a particular equilibrium and are common in the literature, implicitly rely on a restrictive selection of equilibria.
Coercive Trade Policy
Empirical evidence suggests trade coercion exercised unilaterally is significantly less likely to induce concessions than coercion exercised through an international organization. In this paper we build a two-country model of coercion that can provide a rationale for this finding, and for how "weak"' international institutions might be effective, even if their rulings cannot be directly enforced. In particular we show that if coercion is unilateral, the country requesting the policy change will demand a concession so substantial to make it unacceptable to its partner, and a trade war will ensue. If the parties can instead commit to an international organization (IO), compliance is more likely, because the potential IO ruling places a cap on the Foreign government's incentives to signal its resolve.
Policy Experimentation, Redistribution and Voting Rules
We study conditions under which optimal policy experimentation can be implemented by a committee. We consider a dynamic bargaining game in which, each period, committee members choose to implement a risky reform or implement a policy with known returns. We first show that when no redistribution is allowed the unique equilibrium outcome is generically inefficient. When committee members are allowed to redistribute resources (even arbitrarily small amounts), there always exists an equilibrium that supports optimal experimentation for any non-collegial voting rule. With collegial voting rules, however, optimal policy experimentation is possible only with a sufficient amount of redistribution. We conclude that veto rights, not constraints on redistribution, constitute the main obstacle to optimal policy experimentation.
Bargaining Over an Endogenous Agenda
We present a model of bargaining in which a committee searches over the policy space, successively amending the default by voting over proposals. Bargaining ends when proposers are unable or unwilling to amend the existing default, which is then implemented. We characterize the policies which can be implemented from any initial default in a pure strategy stationary Markov perfect equilibrium for an interesting class of environments including multi-dimensional and infinite policy spaces. Minimumwinning coalitions may not form, and the set of equilibrium policies may be unaffected by a change in the set of proposers. The set of stable policies (which are implemented, once reached as default) f...
