How Likely is Contagion in Financial Networks?
Interconnections among financial institutions create potential channels for contagion and amplification of shocks to the financial system.� We propose precise definitions of these concepts and analyze their magnitude.� Contagion occurs when a shock to the assets of a single firm causes other firms to default through the network of obligations; amplification occurs when losses among defaulting nodes keep escalating due to their indebtedness to one another.� Contagion is weak if the probability of default through contagion is no greater than the probability of default through independent direct shocks to the defaulting nodes.� We derive a general formula which shows that, for a wide variety of shock distributions, contagion is weak unless the triggering node is large and/or highly leveraged compared to the nodes it topples through contagion.� We also estimate how much the interconnections between nodes increase total losses beyond the level that would be incurred without interconnections.� A distinguishing feature of our approach is that the results do not depend on the specific topology: they hold for any financial network with a given distribution of bank sizes and leverage levels.� We apply the framework to European Banking Authority data and show that both the probability of contagion and the expected increase in losses are small under a wide variety of shock distributions.� Our conclusion is that the direct transmission of shocks through payment obligations does not have a major effect on defaults and losses; other mechanisms such as loss of confidence and declines in credit quality are more llikely sources of contagion.
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- Helmut Elsinger & Alfred Lehar & Martin Summer, 2002.
"Risk Assessment for Banking Systems,"
79, Oesterreichische Nationalbank (Austrian Central Bank).
- N. Lesca, 2010. "Introduction," Post-Print halshs-00640602, HAL.
- Dimitrios P Tsomocos & Charles A.E. Goodhart, 2004.
"A Model to Analyse Financial Fragility: Applications,"
Economics Series Working Papers
2004-FE-05, University of Oxford, Department of Economics.
- Goodhart, Charles A. E. & Sunirand, Pojanart & Tsomocos, Dimitrios P., 2004. "A model to analyse financial fragility: applications," Journal of Financial Stability, Elsevier, vol. 1(1), pages 1-30, September.
- Charles A.E. Goodhart & Pojanart Sunirand & Dimitrios P. Tsomocos, 2004. "A Model to Analyse Financial Fragility: Applications," OFRC Working Papers Series 2004fe05, Oxford Financial Research Centre.
- Charles Goodhart & Pojanart Sunirand & Dimitrios P. Tsomocos, 2004. "A model to analyse financial fragility: applications," LSE Research Online Documents on Economics 24680, London School of Economics and Political Science, LSE Library.
- Rodrigo Cifuentes & Hyun Song Shin & Gianluigi Ferrucci, 2005.
"Liquidity Risk and Contagion,"
Journal of the European Economic Association,
MIT Press, vol. 3(2-3), pages 556-566, 04/05.
- Upper, Christian, 2011. "Simulation methods to assess the danger of contagion in interbank markets," Journal of Financial Stability, Elsevier, vol. 7(3), pages 111-125, August.
- Battiston, Stefano & Gatti, Domenico Delli & Gallegati, Mauro & Greenwald, Bruce & Stiglitz, Joseph E., 2012.
"Default cascades: When does risk diversification increase stability?,"
Journal of Financial Stability,
Elsevier, vol. 8(3), pages 138-149.
- Stefano Battiston & Domenico Delli Gatti & Mauro Gallegati & Bruce Greenwald & Joseph E. Stiglitz, . "Default Cascades: When Does Risk Diversification Increase Stability?," Working Papers ETH-RC-11-006, ETH Zurich, Chair of Systems Design.
- Nier, Erlend & Yang, Jing & Yorulmazer, Tanju & Alentorn, Amadeo, 2008.
"Network models and financial stability,"
Bank of England working papers
346, Bank of England.
- Hans Degryse & Grégory Nguyen, 2004.
"Interbank exposures: an empirical examination of systemic risk in the Belgian banking system,"
Working Paper Research
43, National Bank of Belgium.
- Degryse, H.A. & Nguyen, G., 2004. "Interbank Exposures : An Empirical Examination of Systemic Risk in the Belgian Banking System," Discussion Paper 2004-4, Tilburg University, Center for Economic Research.
- Georg, Co-Pierre, 2011. "The effect of the interbank network structure on contagion and common shocks," Discussion Paper Series 2: Banking and Financial Studies 2011,12, Deutsche Bundesbank, Research Centre.
- Gai, Prasanna & Kapadia, Sujit, 2010. "Contagion in financial networks," Bank of England working papers 383, Bank of England.
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