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Collective Rationality: Equilibrium in Cooperative Games

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Groups of people perform acts that are subject to standards of rationality. A committee may sensibly award fellowships, or may irrationally award them in violation of its own policies. A theory of collective rationality defines collective acts that are evaluable for rationality and formulates principles for their evaluation. This book argues that a group's act is evaluable for rationality if it is the products of acts its members fully control. It also argues that such an act is collectively rational if the acts of the group's members are rational. Efficiency is a goal of collective rationality, but not a requirement, except in cases where conditions are ideal for joint action and agents have rationally prepared for joint action.

The people engaged in a game of strategy form a group, and the combination of their acts yields a collective act. If their collective act is rational, it constitutes a solution to their game. A theory of collective rationality yields principles concerning solutions to games. One principle requires that a solution constitute an equilibrium among the incentives of the agents in the game. In a cooperative game some agents are coalitions of individuals, and it may be impossible for all agents to pursue all incentives. Because rationality is attainable, the appropriate equilibrium standard for cooperative games requires that agents pursue only incentives that provide sufficient reasons to act. The book's theory of collective rationality supports an attainable equilibrium-standard for solutions to cooperative games and shows that its realization follows from individuals' rational acts.

By extending the theory of rationality to groups, this book reveals the characteristics that make an act evaluable for rationality and the way rationality's evaluation of an act responds to the type of control its agent exercises over the act. The book's theory of collective rationality contributes to philosophical projects such as contractarian ethics and to practical projects such as the design of social institutions.

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Editorial Reviews

From the Publisher
"My overall conclusion is the Weirich's theory of collective rationality is a very precise, internally coherent, and highly impressive contribution to the literature. It deserves to be carefully studied in the years to come." —Notre Dame Philosophical Reviews
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Product Details

  • ISBN-13: 9780195388381
  • Publisher: Oxford University Press
  • Publication date: 12/1/2009
  • Pages: 288
  • Product dimensions: 6.20 (w) x 9.30 (h) x 0.90 (d)

Meet the Author

Paul Weirich is Professor of Philosophy at the University of Missouri.

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Table of Contents

1. Rationality Writ Large
1.1. Collective Acts
1.2. Method
1.3. Guide
2. Agents and Acts
2.1. Agents
2.2. Acts
2.3. Control
2.4. Evaluability
3. Rationality
3.1. Metatheory
3.2. Attainability
3.3. Comprehensiveness
3.4. Compositionality
4. Groups
4.1. Extension
4.2. Efficiency
4.3. Collective Utility
4.4. Compositionality
5. Games of Strategy
5.1. Games
5.2. Solutions
5.3. Standards
6. Equilibrium
6.1. Standards and Procedures
6.2. Utility Maximization
6.3. Self-Support
6.4. Strategic Equilibrium
6.5. Realization of an Equilibrium
6.6. Appendix: Realization of a Nash Equilibrium
7. Coordination
7.1. Strategy and Learning
7.2. Changing the Rules
7.3. An Efficient Equilibrium
7.4. Preparation
7.5. Intentions
8. Cooperative Games
8.1. Joint Action
8.2. Opportunities for Joint Action
8.3. Coalitional Games
8.4. The Core
8.5. An Empty Core
9. Strategy for Coalitions
9.1. A Coalition's Incentives
9.2. Paths of Incentives
9.3. Strategic Equilibrium in Coalitional Games
10. Illustrations and Comparisons
10.1. The Majority-Rule Game
10.2. Comparisons
10.3. Conflict
10.4. Collective Standards
11. Compositionality
11.1. Underlying Games
11.2. Confirmation
11.3. Agreement Games
11.4. The Core and Utility Maximization
11.5. Strategic Equilibrium and Self-Support
12. Implications
12.1. Social Institutions
12.2. Strategic Equilibrium and Institutions
12.3. Theoretical Unity
12.4. Future Research

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