Kingmakers and leaders in coalition formation
AbstractAssume that players strictly rank each other as coalition partners. We propose a procedure whereby they “fall back” on their preferences, yielding internally compatible, or coherent, majority coalition(s), which we call fallback coalitions. If there is more than one fallback coalition, the players common to them, or kingmakers, determine which fallback coalition will form. The first player(s) acceptable to all other members of a fallback coalition are the leader(s) of that coalition. The effects of different preference assumption--particularly, different kinds of single-peakedness--and of player weights on the number of coherent coalitions, their connectedness, and which players become kingmakers and leaders are investigated. The fallback procedure may be used (i) empirically to identify kingmakers and leaders or (ii) normatively to select them. We illustrate and test the model by applying it to coalition formation on the U.S. Supreme Court, 2005-2009, which shows the build-up over stages of a conservative coalition that prevailed in nearly half of the 5-4 decisions.
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Bibliographic InfoPaper provided by University Library of Munich, Germany in its series MPRA Paper with number 22710.
Date of creation: Mar 2010
Date of revision:
coalition formation; fallback procedure; kingmakers; leaders; US Supreme Court;
Other versions of this item:
- D72 - Microeconomics - - Analysis of Collective Decision-Making - - - Political Processes: Rent-seeking, Lobbying, Elections, Legislatures, and Voting Behavior
- C7 - Mathematical and Quantitative Methods - - Game Theory and Bargaining Theory
- D85 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Network Formation
This paper has been announced in the following NEP Reports:
- NEP-ALL-2010-05-22 (All new papers)
- NEP-CDM-2010-05-22 (Collective Decision-Making)
- NEP-GTH-2010-05-22 (Game Theory)
- NEP-NET-2010-05-22 (Network Economics)
- NEP-POL-2010-05-22 (Positive Political Economics)
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