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Risk-Sharing Networks

Listed author(s):
  • Yann Bramoullé
  • Rachel Kranon

This paper considers the formation of risk-sharing networks. Following empirical findings, we build a model where risk-sharing takes place between pairs of individuals. We ask what structures emerge when pairs can agree to form links, but people cannot coordinate links across a population. We consider a benchmark model where identical individuals commit to share their monetary holdings equally with linked partners. We compare efficient networks to equilibrium networks. Efficient networks can (indirectly) connect all individuals and involve full insurance. However, equilibrium networks connect fewer individuals. There is an externality: when breaking a link individuals do not take into account the negative effect on others distant in the network. The network formation process can lead identical individuals to be in different positions and thus have different risk-sharing outcomes. These results may help explain empirical findings that risk-sharing is often not symmetric or complete.

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File URL: http://www.cirpee.org/fileadmin/documents/Cahiers_2005/CIRPEE05-26.pdf
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Paper provided by CIRPEE in its series Cahiers de recherche with number 0526.

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Date of creation: 2005
Handle: RePEc:lvl:lacicr:0526
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  1. Marcel Fafchamps & Susan Lund, "undated". "Risk Sharing Networks in Rural Philippines," Working Papers 97014, Stanford University, Department of Economics.
  2. Jackson, Matthew O. & Watts, Alison, 2002. "The Evolution of Social and Economic Networks," Journal of Economic Theory, Elsevier, vol. 106(2), pages 265-295, October.
  3. Coate, Stephen & Ravallion, Martin, 1993. "Reciprocity without commitment : Characterization and performance of informal insurance arrangements," Journal of Development Economics, Elsevier, vol. 40(1), pages 1-24, February.
  4. Robert M. Townsend, "undated". "Risk and Insurance in Village India," University of Chicago - Population Research Center 91-3a, Chicago - Population Research Center.
  5. Coate, S. & Ravallion, M., 1989. "Reciprocity Without Commitment: Characterization and Performance of Informal Risk-Sharing Arrangements," Papers 96, Warwick - Development Economics Research Centre.
  6. Stefan Dercon & Joachim De Weerdt, 2002. "Risk-sharing networks and insurance against illness," CSAE Working Paper Series 2002-16, Centre for the Study of African Economies, University of Oxford.
  7. Rosenzweig, Mark R. & Stark, Oded, 1987. "Consumption Smoothing, Migration and Marriage: Evidence from Rural India," Bulletins 7515, University of Minnesota, Economic Development Center.
  8. Francis Bloch (GREQAM and Universite de la Mediterranee), Garance Genicot (Georgetown University, and Debraj Ray (New York University and Instituto de Analisis Economico (CSIC)), 2004. "Informal Insurance in Social Networks," Working Papers gueconwpa~04-04-16, Georgetown University, Department of Economics.
  9. Murgai, Rinku & Winters, Paul & Sadoulet, Elisabeth & Janvry, Alain de, 2002. "Localized and incomplete mutual insurance," Journal of Development Economics, Elsevier, vol. 67(2), pages 245-274, April.
  10. Garance Genicot & Debraj Ray, 2003. "Group Formation in Risk-Sharing Arrangements," Review of Economic Studies, Oxford University Press, vol. 70(1), pages 87-113.
  11. Udry, Christopher, 1995. "Risk and Saving in Northern Nigeria," American Economic Review, American Economic Association, vol. 85(5), pages 1287-1300, December.
  12. De Weerdt, Joachim, 2002. "Risk-Sharing and Endogenous Network Formation," WIDER Working Paper Series 057, World Institute for Development Economic Research (UNU-WIDER).
  13. Jackson, Matthew O. & Wolinsky, Asher, 1996. "A Strategic Model of Social and Economic Networks," Journal of Economic Theory, Elsevier, vol. 71(1), pages 44-74, October.
  14. Alan Kirman, 1993. "Ants, Rationality, and Recruitment," The Quarterly Journal of Economics, Oxford University Press, vol. 108(1), pages 137-156.
  15. Kimball, Miles S, 1988. "Farmers' Cooperatives as Behavior Toward Risk," American Economic Review, American Economic Association, vol. 78(1), pages 224-232, March.
  16. Rothschild, Michael & Stiglitz, Joseph E., 1971. "Increasing risk II: Its economic consequences," Journal of Economic Theory, Elsevier, vol. 3(1), pages 66-84, March.
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