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Diversification and Financial Stability

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  • Paolo Tasca

    ()

  • Stefano Battiston

Abstract

The recent credit crisis of 2007/08 has raised a debate about the so-called knife-edge properties of financial markets. The paper contributes to the debate shedding light on the controversial relation between risk-diversification and financial stability. We model a financial network where assets held by borrowers to meet their obligations, include claims against other borrowers and securities exogenous to the network. The balance-sheet approach is conjugated with a stochastic setting and by a mean-field approximation the law of motion of the system's fragility is derived. We show that diversification has an ambiguous effect and beyond a certain levels elicits financial instability. Moreover, we find that risk-sharing restrictions create a socially preferable outcome. Our findings have significant implications for future policy recommendation.

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Bibliographic Info

Paper provided by ETH Zurich, Chair of Systems Design in its series Working Papers with number CCSS-11-001.

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Handle: RePEc:stz:wpaper:ccss-11-001

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Keywords: Systemic Risk; Financial Crisis; Diversification; Default Probability;

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References

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  1. Battiston, Stefano & Delli Gatti, Domenico & Gallegati, Mauro & Greenwald, Bruce & Stiglitz, Joseph E., 2012. "Liaisons dangereuses: Increasing connectivity, risk sharing, and systemic risk," Journal of Economic Dynamics and Control, Elsevier, vol. 36(8), pages 1121-1141.
  2. Wagner, W.B., 2006. "Diversification at Financial Institutions and Systemic Crises," Discussion Paper 2006-71, Tilburg University, Center for Economic Research.
  3. Franklin Allen & Ana Babus & Elena Carletti, 2010. "Financial Connections and Systemic Risk," Economics Working Papers ECO2010/30, European University Institute.
  4. Florian Wagener & Cars Hommes & William Brock, 2006. "More hedging instruments may destabilize markets," Working Papers wp06-11, Warwick Business School, Finance Group.
  5. HyunSong Shin, 2009. "Securitisation and Financial Stability," Economic Journal, Royal Economic Society, vol. 119(536), pages 309-332, 03.
  6. Ibragimov, Rustam & Walden, Johan, 2007. "The limits of diversification when losses may be large," Journal of Banking & Finance, Elsevier, vol. 31(8), pages 2551-2569, August.
  7. Ibragimov, Rustam & Jaffee, Dwight & Walden, Johan, 2011. "Diversification disasters," Journal of Financial Economics, Elsevier, vol. 99(2), pages 333-348, February.
  8. Shin, Hyun Song, 2008. "Risk and liquidity in a system context," Journal of Financial Intermediation, Elsevier, vol. 17(3), pages 315-329, July.
  9. Merton, Robert C, 1974. "On the Pricing of Corporate Debt: The Risk Structure of Interest Rates," Journal of Finance, American Finance Association, vol. 29(2), pages 449-70, May.
  10. Rustam Ibragimov & Johan Walden, 2006. "The Limits of Diversification When Losses May Be Large," Harvard Institute of Economic Research Working Papers 2104, Harvard - Institute of Economic Research.
  11. Larry Eisenberg & Thomas H. Noe, 2001. "Systemic Risk in Financial Systems," Management Science, INFORMS, vol. 47(2), pages 236-249, February.
  12. Joseph E. Stiglitz, 2010. "Risk and Global Economic Architecture: Why Full Financial Integration May Be Undesirable," NBER Working Papers 15718, National Bureau of Economic Research, Inc.
  13. Nier, Erlend & Yang, Jing & Yorulmazer, Tanju & Alentorn, Amadeo, 2007. "Network models and financial stability," Journal of Economic Dynamics and Control, Elsevier, vol. 31(6), pages 2033-2060, June.
  14. Franklin Allen & Douglas Gale, 1999. "Financial Contagion," Levine's Working Paper Archive 2092, David K. Levine.
  15. Ibragimov, Rustam & Walden, Johan, 2007. "The limits of diversification when losses may be large," Scholarly Articles 2624460, Harvard University Department of Economics.
  16. Acharya, Viral V., 2009. "A theory of systemic risk and design of prudential bank regulation," Journal of Financial Stability, Elsevier, vol. 5(3), pages 224-255, September.
  17. Iori, Giulia & Jafarey, Saqib & Padilla, Francisco G., 2006. "Systemic risk on the interbank market," Journal of Economic Behavior & Organization, Elsevier, vol. 61(4), pages 525-542, December.
  18. Helmut Elsinger & Alfred Lehar & Martin Summer, 2002. "Risk Assessment for Banking Systems," Working Papers 79, Oesterreichische Nationalbank (Austrian Central Bank).
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Citations

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Cited by:
  1. Tasca, Paolo & Mavrodiev, Pavlin & Schweitzer, Frank, 2013. "Quantifying the Impact of Leveraging and Diversification on Systemic Risk," Research Program in Finance, Working Paper Series qt7s57834n, Research Program in Finance, Institute for Business and Economic Research, UC Berkeley.
  2. Paolo Tasca & Stefano Battiston, . "Market Procyclicality and Systemic Risk," Working Papers ETH-RC-12-012, ETH Zurich, Chair of Systems Design.
  3. Balli, Faruk & Basher, Syed Abul & Balli, Hatice Ozer, 2013. "International Income Risk-Sharing and the Global Financial Crisis of 2008--2009," MPRA Paper 43720, University Library of Munich, Germany.
  4. Giovanni Dosi & Giorgio Fagiolo & Mauro Napoletano & Andrea Roventini & Tania Treibich, 2014. "Fiscal and Monetary Policies in Complex Evolving Economies," Working Papers 05/2014, University of Verona, Department of Economics.

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