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Stable allocations of risk

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  • Csóka, Péter
  • Herings, P. Jean-Jacques
  • Kóczy, László Á.

Abstract

The measurement and the allocation of risk are fundamental problems of portfolio management. Coherent measures of risk provide an axiomatic approach to the former problem. In an environment given by a coherent measure of risk and the various portfolios' realization vectors, risk allocation games aim at solving the second problem: How to distribute the diversification benefits of the various portfolios? Understanding these cooperative games helps us to find stable, efficient, and fair allocations of risk. We show that the class of risk allocation and totally balanced games coincide, hence a stable allocation of risk is always possible. When the aggregate portfolio is riskless, the class of risk allocation games coincides with the class of exact games. As in exact games any subcoalition may be subject to marginalization even in core allocations, our result further emphasizes the responsibility involved in allocating risk.

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Bibliographic Info

Article provided by Elsevier in its journal Games and Economic Behavior.

Volume (Year): 67 (2009)
Issue (Month): 1 (September)
Pages: 266-276

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Handle: RePEc:eee:gamebe:v:67:y:2009:i:1:p:266-276

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Web page: http://www.elsevier.com/locate/inca/622836

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Keywords: Coherent measures of risk Risk allocation games Totally balanced games Exact games;

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References

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  1. Csóka, Péter & Herings, P. Jean-Jacques & Kóczy, László Á., 2006. "Coherent Measures of Risk from a General Equilibrium Perspective," Research Memorandum 016, Maastricht University, Maastricht Research School of Economics of Technology and Organization (METEOR).
  2. Hans Reijnierse & Jean Derks, 1998. "Note On the core of a collection of coalitions," International Journal of Game Theory, Springer, vol. 27(3), pages 451-459.
  3. Péter Csóka & P. Jean-Jacques Herings & László Á. Kóczy, 2007. "Balancedness Conditions for Exact Games," Working Paper Series 0805, Óbuda University, Keleti Faculty of Business and Management, revised May 2008.
  4. Ehud Kalai & Eitan Zemel, 1980. "On Totally Balanced Games and Games of Flow," Discussion Papers 413, Northwestern University, Center for Mathematical Studies in Economics and Management Science.
  5. Shapley, Lloyd S. & Shubik, Martin, 1969. "On market games," Journal of Economic Theory, Elsevier, vol. 1(1), pages 9-25, June.
  6. Acerbi, Carlo & Tasche, Dirk, 2002. "On the coherence of expected shortfall," Journal of Banking & Finance, Elsevier, vol. 26(7), pages 1487-1503, July.
  7. Tijs, S.H. & Parthasarathy, T. & Potters, J.A.M. & Rajendra Prasad, V., 1984. "Permutation games: Another class of totally balanced games," Open Access publications from Tilburg University urn:nbn:nl:ui:12-154278, Tilburg University.
  8. Acerbi, Carlo, 2002. "Spectral measures of risk: A coherent representation of subjective risk aversion," Journal of Banking & Finance, Elsevier, vol. 26(7), pages 1505-1518, July.
  9. Herings,P. Jean-Jacques & Predtetchinski,Arkadi, 2002. "A Necessary and Sufficient Condition for Non--emptiness of the Core of a Non--transferable Utility Game," Research Memorandum 016, Maastricht University, Maastricht Research School of Economics of Technology and Organization (METEOR).
  10. Biswas, A. K. & Parthasarathy, T. & Potters, J. A. M. & Voorneveld, M., 1999. "Large Cores and Exactness," Games and Economic Behavior, Elsevier, vol. 28(1), pages 1-12, July.
  11. Legut, Jerzy, 1990. "On totally balanced games arising from cooperation in fair division," Games and Economic Behavior, Elsevier, vol. 2(1), pages 47-60, March.
  12. Ehud Kalai & Eitan Zemel, 1980. "Generalized Network Problems Yielding Totally Balanced Games," Discussion Papers 425, Northwestern University, Center for Mathematical Studies in Economics and Management Science.
  13. Calleja, Pedro & Borm, Peter & Hendrickx, Ruud, 2005. "Multi-issue allocation situations," European Journal of Operational Research, Elsevier, vol. 164(3), pages 730-747, August.
  14. Philippe Artzner & Freddy Delbaen & Jean-Marc Eber & David Heath, 1999. "Coherent Measures of Risk," Mathematical Finance, Wiley Blackwell, vol. 9(3), pages 203-228.
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Citations

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Cited by:
  1. Lohmann E. & Borm P. & Herings P.J.J., 2011. "Minimal exact balancedness," Research Memorandum 009, Maastricht University, Maastricht Research School of Economics of Technology and Organization (METEOR).
  2. Péter Csóka & P. Jean-Jacques Herings & László Á. Kóczy, 2007. "Balancedness Conditions for Exact Games," Working Paper Series 0805, Óbuda University, Keleti Faculty of Business and Management, revised May 2008.
  3. Csóka, Péter & Jean-Jacques Herings, P. & Kóczy, László Á. & Pintér, Miklós, 2011. "Convex and exact games with non-transferable utility," European Journal of Operational Research, Elsevier, vol. 209(1), pages 57-62, February.
  4. Peter Csoka & P. Jean-Jacques Herings, 2013. "Risk Allocation under Liquidity Constraints," IEHAS Discussion Papers 1331, Institute of Economics, Centre for Economic and Regional Studies, Hungarian Academy of Sciences.
  5. Csóka, Péter & Pintér, Miklós, 2010. "On the impossibility of fair risk allocation," MPRA Paper 26515, University Library of Munich, Germany.
  6. Dora Balog, 2011. "Capital allocation in financial institutions: the Euler method," IEHAS Discussion Papers 1126, Institute of Economics, Centre for Economic and Regional Studies, Hungarian Academy of Sciences.
  7. Csóka, Péter & Bátyi, Tamás László & Pintér, Miklós & Balog, Dóra, 2011. "Tőkeallokációs módszerek és tulajdonságaik a gyakorlatban
    [Methods of capital allocation and their characteristics in practice]
    ," Közgazdasági Szemle (Economic Review - monthly of the Hungarian Academy of Sciences), Közgazdasági Szemle Alapítvány (Economic Review Foundation), vol. 0(7), pages 619-632.

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