Robert Aumann's and Thomas Schelling's Contributions to Game Theory: Analyses of Conflict and Cooperation

Advanced information on the Bank of Sweden Prize in Economic Sciences in Memory of Alfred Nobel 2005.Game Theory;

Public beliefs and corruption in a repeated psychological game

This paper investigates the role of guilt aversion for corruption in public administration. Corruption is modeled as the outcome of a game played between a bureaucrat, a lobby, and the public. There is a moral cost of corruption for the bureaucrat, who is averse to letting the public down. We study how the behavior of the lobby and the bureaucrat depend on perceived public beliefs, when these are constant and when they are allowed to vary over time. With time-varying beliefs, corruption is more likely when the horizon of the game is relatively long and when public beliefs are initially low and are updated fast.psychological games, corruption, bureaucracy, guilt, third party

Mediation and peace

This paper applies mechanism design to conflict resolution. We determine when and how unmediated communication and mediation reduce the ex ante probability of conflict in a game with asymmetric information. Mediation improves upon unmediated communication when the intensity of conflict is high, or when asymmetric information is significant. The mediator improves upon unmediated communication by not precisely reporting information to conflicting parties, and precisely, by not revealing to a player with probability one that the opponent is weak. Arbitrators who can enforce settlements are no more effective than mediators who only make non-binding recommendations

Selling information in extensive form games.

We consider a situation in wich decision markets in an extensive form game can by aditional information from an information seller before reaching their decisions. Prices for information are selected by the seller. We analyze a variety of scenarios for the price sitting process by the seller: the case in which prices are chosen before the game stars (ex-ante pricing), the case in which prices are chosen during the game (ex-post pricing) and the situation in which the seller can pit buyers against each other in determining what information is to be sold. Within the context of ex-ante pricin, we also consider the situaction in which the pricise information offered to the decision makers is not exogenously given but is selected by the seller.Extensive form games; Information;

Climate change in game theory

The study provides an overview of the application possibilities of game theory to climate change. The characteristics of games are adapted to the topics of climate and carbon. The importance of uncertainty, probability, marginal value of adaptation, common pool resources, etc. are tailored to the context of international relations and the challenge of global warming

Climate change in game theory context

The aim of this paper is to survey the game theory modelling of the behaviour of global players in mitigation and adaptation related to climate change. Three main fields are applied for the specific aspects of temperature rise: behaviour games, CPR problem and negotiation games. The game theory instruments are useful in analyzing strategies in uncertain circumstances, such as the occurrence and impacts of climate change. To analyze the international players’ relations, actions, attitude toward carbon emission, negotiation power and motives, several games are applied for the climate change in this paper. The solution is surveyed, too, for externality problem

Mechanisms for Automated Negotiation in State Oriented Domains

This paper lays part of the groundwork for a domain theory of negotiation, that is, a way of classifying interactions so that it is clear, given a domain, which negotiation mechanisms and strategies are appropriate. We define State Oriented Domains, a general category of interaction. Necessary and sufficient conditions for cooperation are outlined. We use the notion of worth in an altered definition of utility, thus enabling agreements in a wider class of joint-goal reachable situations. An approach is offered for conflict resolution, and it is shown that even in a conflict situation, partial cooperative steps can be taken by interacting agents (that is, agents in fundamental conflict might still agree to cooperate up to a certain point). A Unified Negotiation Protocol (UNP) is developed that can be used in all types of encounters. It is shown that in certain borderline cooperative situations, a partial cooperative agreement (i.e., one that does not achieve all agents' goals) might be preferred by all agents, even though there exists a rational agreement that would achieve all their goals. Finally, we analyze cases where agents have incomplete information on the goals and worth of other agents. First we consider the case where agents' goals are private information, and we analyze what goal declaration strategies the agents might adopt to increase their utility. Then, we consider the situation where the agents' goals (and therefore stand-alone costs) are common knowledge, but the worth they attach to their goals is private information. We introduce two mechanisms, one 'strict', the other 'tolerant', and analyze their affects on the stability and efficiency of negotiation outcomes.Comment: See http://www.jair.org/ for any accompanying file

Mediation and Peace

This paper applies mechanism design to conict resolution. We determine when and how unmediated communication and mediation reduce the ex ante probability of conflict in a game with asymmetric information. Mediation improves upon unmediated communication when the intensity of conict is high, or when asymmetric information is significant. The mediator improves upon unmediated communication by not precisely reporting information to conflicting parties, and precisely, by not revealing to a player with probability one that the opponent is weak. Arbitrators who can enforce settlements are no more effective than mediators who only make non-binding recommendations.