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Risk-Sharing and Contagion in Networks

  • Antonio Cabrales
  • Piero Gottardi
  • Fernando Vega-Redondo

We investigate the trade-off between the risk-sharing gains enjoyed by more interconnected firms and the costs resulting from an increased risk exposure. We find that when the shock distribution displays “fat” tails, extreme segmentation into small components is optimal, while minimal segmentation and high density of connections are optimal when the distribution exhibits “thin” tails. For less regular distributions, intermediate degrees of segmentation and sparser connections are optimal. Also, if firms are heterogeneous, optimality requires perfect assortativity in a component. In general, however, a conflict arises between efficiency and pairwise stability, due to a “size externality” not internalized by firms.

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File URL: http://www.cesifo-group.de/portal/page/portal/DocBase_Content/WP/WP-CESifo_Working_Papers/wp-cesifo-2014/wp-cesifo-2014-03/cesifo1_wp4715.pdf
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Paper provided by CESifo Group Munich in its series CESifo Working Paper Series with number 4715.

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Date of creation: 2014
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Handle: RePEc:ces:ceswps:_4715
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  1. Antoni Calvó-Armengol & Rahmi Ilkiliç, 2005. "Pairwise-Stability and Nash Equilibria in Network Formation," Working Papers 2005.34, Fondazione Eni Enrico Mattei.
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  7. Francis Bloch & Garance Genicot, 2005. "Informal Insurance in Social Networks," 2005 Meeting Papers 156, Society for Economic Dynamics.
    • 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.
  8. Yann Bramoullé & Rachel Kranon, 2005. "Risk-Sharing Networks," Cahiers de recherche 0526, CIRPEE.
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  10. Paul Krugman, 1999. "Balance Sheets, the Transfer Problem, and Financial Crises," International Tax and Public Finance, Springer, vol. 6(4), pages 459-472, November.
  11. Daron Acemoglu & Asuman Ozdaglar & Alireza Tahbaz-Salehi, 2015. "Systemic Risk and Stability in Financial Networks," American Economic Review, American Economic Association, vol. 105(2), pages 564-608, February.
  12. H Peyton Young & Paul Glasserman, 2013. "How Likely is Contagion in Financial Networks?," Economics Series Working Papers 642, University of Oxford, Department of Economics.
  13. Helmut Elsinger & Alfred Lehar & Martin Summer, 2002. "Risk Assessment for Banking Systems," Working Papers 79, Oesterreichische Nationalbank (Austrian Central Bank).
  14. Yaron Leitner, 2005. "Financial Networks: Contagion, Commitment, and Private Sector Bailouts," Journal of Finance, American Finance Association, vol. 60(6), pages 2925-2953, December.
  15. Goyal, Sanjeev & Vega-Redondo, Fernando, 2007. "Structural holes in social networks," Journal of Economic Theory, Elsevier, vol. 137(1), pages 460-492, November.
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