Power Indices And Coalition Formation

In recent years, publications on power indices and coalition formation have multiplied. Obviously, the application of these concepts to political institutions, more specifically, to the analysis of the European Union and, as it seems, the election of the President of the United States is getting more and more popular. There are, however, also new theoretical instruments and perspectives that support these applications: First of all, the probabilistic model of coalition formation has to be mentioned which is made operational by the multilinear extension of the characteristic function form of coalition games. This instrument triggered off a reinterpretation of existing power indices and the formulation of new indices. This development is accompanied by an intensive discussion of the concept of power in general - what do we measure when we apply power measures? - and the properties that an adequate measure of power has to satisfy. Various concepts of monotonicity were proposed as litmus test. The discussion shows that the underlying theories of coalition formation play a decisive role. New results will be discussed in this volume. Its contributions put flesh and blood on the theoretical innovations and their applications that led to a growing interest in power indices and coalition formation.

Coalition Formation and Social Choice provides a unified and comprehensive study of coalition formation and collective decision-making in committees. It discusses the main existing theories including the size principle, conflict of interest theory, dominant player theory, policy distance theory and power excess theory. In addition, the book offers new theories of coalition formation in which the endogenous formation of preferences for coalitions is basic. Both simple game theory and social choice theory are extensively applied in the treatment of the theories. This combined application not only leads to new theories but also offers a new and fresh perspective on coalition formation and collective decision-making in committees. The book covers the fundamental concepts and results of social choice theory including Arrow's Impossibility Theorem. Furthermore, it gives a coherent treatment of the theory of simple games. Besides more traditional topics in simple game theory like power indices, it also introduces new aspects of simple games such as the Chow parameter, the Chow vector and the notion of similar games.

The Encyclopedia provides a detailed and comprehensive account of the subject known as public choice. However, the title would not convey suf- ciently the breadth of the Encyclopedia’s contents which can be summarized better as the fruitful interchange of economics, political science and moral philosophy on the basis of an image of man as a purposive and responsible actor who pursues his own objectives as efficiently as possible. This fruitful interchange between the fields outlined above existed during the late eighteenth century during the brief period of the Scottish Enlightenment when such great scholars as David Hume, Adam Ferguson and Adam Smith contributed to all these fields, and more. However, as intell- tual specialization gradually replaced broad-based scholarship from the m- nineteenth century onwards, it became increasingly rare to find a scholar making major contributions to more than one. Once Alfred Marshall defined economics in neoclassical terms, as a n- row positive discipline, the link between economics, political science and moral philosophy was all but severed and economists redefined their role into that of ‘the humble dentist’ providing technical economic information as inputs to improve the performance of impartial, benevolent and omniscient governments in their attempts to promote the public interest. This indeed was the dominant view within an economics profession that had become besotted by the economics of John Maynard Keynes and Paul Samuelson immediately following the end of the Second World War.

This volume is dedicated to Horst Todt who celebrated his seventieth an niversaryon March 14, 2000. All the contributors know Horst Todt personally and (with the exception of two younger co-authors) have accompanied his scientific career for sev eral years, some as his assistants, some as his colleagues at the Frankfurt or Hamburg University, some as fellow members in scientific societies. All who know him acknowledge inspiring conversations on a broad field of issues often reaching far beyond the scope of economics. Being friendly and entertaining and without exaggerated personal ambition he often initiated work which others completed. In particular the two editors of this volume experienced and enjoyed the stimulating atmosphere at his Chair of Economics at the Hamburg University. We like to remember these scientifically and personally fruitful years under the tutorship of Horst Todt. The editors would like to thank the contributors to this volume for their readiness to cooperate and for the promptness of their delivery.

Drawing upon and extending his inaugural Lipsey Lectures, Debraj Ray looks at coalition formation from the perspective of game theory. Ray brings together developments in both cooperative and noncooperative game theory to study the analytics of coalition formation and binding agreements.

Toward a political theory of organizations; Form of power; Content of power; Authority structure and coalition formation; Interest group versus coalition politics; Conflict as bargaining; Theory of bargaining tactics; Coercion in intraorganizational bargaining; Influence networks and decision making.