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Strategic Formation of Coalitions

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Author Info
Jinpeng Ma () (Economics, Rutgers University, Camden, NJ 08102)
Abstract

Consider a society with a finite number of individuals. A coalition structure is a partition of the set of individuals. Each individual has personal preferences over the set of all coalition structures. We study the strategy proof core and von Neumann and Morgenstern (vN&M) solutions. A roommate problem is a problem in which each coalition in each coalition structure contains at most two members. We show that as long as the core is single-valued, the core is coalitionally strategy proof. Moreover the core mechanism is completely characterized by three properties: strategy proofness, Pareto optimality and individual rationality, in the domain with single-valued core. The single-valued core defines the largest domain one may obtain such a mechanism. We show in an example that the single-valued core is manipulable if coalition structures allow more than two members. Nevertheless we show that the single-valued vN&M solution is coalitionally stratey proof and it is individually rational and Pareto optimal. In fact the vN&M solution is the only mechanism with the three properties in the domain with single-valued vN&M solution.

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Paper provided by Rutgers University, Department of Economics in its series Departmental Working Papers with number 199810.

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Date of creation: 12 Apr 1998
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Handle: RePEc:rut:rutres:199810

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Keywords: the core;

Find related papers by JEL classification:
D40 - Microeconomics - - Market Structure and Pricing - - - General

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  1. Shapley, Lloyd & Scarf, Herbert, 1974. "On cores and indivisibility," Journal of Mathematical Economics, Elsevier, vol. 1(1), pages 23-37, March. [Downloadable!] (restricted)
  2. Roth, Alvin E., 1985. "The college admissions problem is not equivalent to the marriage problem," Journal of Economic Theory, Elsevier, vol. 36(2), pages 277-288, August. [Downloadable!] (restricted)
  3. Bird, Charles G., 1984. "Group incentive compatibility in a market with indivisible goods," Economics Letters, Elsevier, vol. 14(4), pages 309-313. [Downloadable!] (restricted)
  4. Hart, Sergiu & Kurz, Mordecai, 1983. "Endogenous Formation of Coalitions," Econometrica, Econometric Society, vol. 51(4), pages 1047-64, July. [Downloadable!] (restricted)
  5. Demange, Gabrielle, 1987. "Nonmanipulable Cores," Econometrica, Econometric Society, vol. 55(5), pages 1057-74, September. [Downloadable!] (restricted)
  6. Greenberg, Joseph, 1994. "Coalition structures," Handbook of Game Theory with Economic Applications, in: R.J. Aumann & S. Hart (ed.), Handbook of Game Theory with Economic Applications, edition 1, volume 2, chapter 37, pages 1305-1337 Elsevier. [Downloadable!] (restricted)
  7. Dreze, J H & Greenberg, J, 1980. "Hedonic Coalitions: Optimality and Stability," Econometrica, Econometric Society, vol. 48(4), pages 987-1003, May. [Downloadable!] (restricted)
  8. Roth, Alvin E., 1982. "Incentive compatibility in a market with indivisible goods," Economics Letters, Elsevier, vol. 9(2), pages 127-132. [Downloadable!] (restricted)
  9. Lucas, William F., 1992. "Von Neumann-Morgenstern stable sets," Handbook of Game Theory with Economic Applications, in: R.J. Aumann & S. Hart (ed.), Handbook of Game Theory with Economic Applications, edition 1, volume 1, chapter 17, pages 543-590 Elsevier. [Downloadable!] (restricted)
  10. Sonmez, T., 1995. "Strategy-Proofness and Singleton Cores in Generalized Matching Problems," Papers 95-02, Michigan - Center for Research on Economic & Social Theory.
  11. Matthew O. Jackson & Asher Wolinsky, 1995. "A Strategic Model of Social and Economic Networks," Discussion Papers 1098R, Northwestern University, Center for Mathematical Studies in Economics and Management Science. [Downloadable!]
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  12. Roth, Alvin E. & Postlewaite, Andrew, 1977. "Weak versus strong domination in a market with indivisible goods," Journal of Mathematical Economics, Elsevier, vol. 4(2), pages 131-137, August. [Downloadable!] (restricted)
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