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Bank networks: Contagion, systemic risk and prudential policy

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  • Aldasoro, Iñaki
  • Delli Gatti, Domenico
  • Faia, Ester

Abstract

We present a network model of the interbank market in which optimizing risk averse banks lend to each other and invest in non-liquid assets. Market clearing takes place through a tâtonnement process which yields the equilibrium price, while traded quantities are determined by means of an assortative matching process. Contagion occurs through liquidity hoarding, interbank interlinkages and fire sale externalities. The resulting network configuration exhibits a core-periphery structure, dis-assortative behavior and low density. Within this framework we analyze the effects of a stylized set of prudential policies on the stability/efficiency trade-off. Liquidity requirements unequivocally decrease systemic risk, but at the cost of lower efficiency (measured by aggregate investment in non-liquid assets). Equity requirements also tend to reduce risk (hence increase stability), though without reducing significantly overall investment. On this basis, our results provide general support for the Basel III approach based on complementary regulatory metrics.

Suggested Citation

  • Aldasoro, Iñaki & Delli Gatti, Domenico & Faia, Ester, 2017. "Bank networks: Contagion, systemic risk and prudential policy," Journal of Economic Behavior & Organization, Elsevier, vol. 142(C), pages 164-188.
  • Handle: RePEc:eee:jeborg:v:142:y:2017:i:c:p:164-188
    DOI: 10.1016/j.jebo.2017.05.022
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    3. EDOARDO GAFFEO & Lucio Gobbi & Massimo Molinari, 2018. "Bilateral netting and systemic liquidity shortages in banking networks," DEM Working Papers 2018/06, Department of Economics and Management.
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    14. Calimani, Susanna & Hałaj, Grzegorz & Żochowski, Dawid, 2017. "Simulating fire-sales in a banking and shadow banking system," ESRB Working Paper Series 46, European Systemic Risk Board.
    15. Hüser, Anne-Caroline, 2015. "Too interconnected to fail: A survey of the interbank networks literature," SAFE Working Paper Series 91, Research Center SAFE - Sustainable Architecture for Finance in Europe, Goethe University Frankfurt.
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    18. Pawe{l} Smaga & Mateusz Wili'nski & Piotr Ochnicki & Piotr Arendarski & Tomasz Gubiec, 2016. "Can banks default overnight? Modeling endogenous contagion on O/N interbank market," Papers 1603.05142, arXiv.org.
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    21. Bluhm, Marcel, 2015. "Interbank funding as insurance mechanism for (persistent) liquidity shocks," SAFE Working Paper Series 117, Research Center SAFE - Sustainable Architecture for Finance in Europe, Goethe University Frankfurt.
    22. Guillermo Ordonez & Selman Erol, 2017. "Network Reactions to Banking Regulations," 2017 Meeting Papers 1125, Society for Economic Dynamics.

    More about this item

    Keywords

    Banking networks; Systemic risk; Contagion; Fire sales; Prudential regulation;

    JEL classification:

    • D85 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Network Formation
    • G21 - Financial Economics - - Financial Institutions and Services - - - Banks; Other Depository Institutions; Micro Finance Institutions; Mortgages
    • G28 - Financial Economics - - Financial Institutions and Services - - - Government Policy and Regulation
    • C63 - Mathematical and Quantitative Methods - - Mathematical Methods; Programming Models; Mathematical and Simulation Modeling - - - Computational Techniques
    • L14 - Industrial Organization - - Market Structure, Firm Strategy, and Market Performance - - - Transactional Relationships; Contracts and Reputation

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