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Bank networks: Contagion, systemic risk and prudential policy

Author

Listed:
  • 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 a matching algorithm. Contagion occurs through liquidity hoarding, interbank interlinkages and fire sale externalities. The resulting network configuration exhibits a coreperiphery structure, dis-assortative behavior and low density. Within this framework we analyze the effects 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 tend to reduce risk (hence increase stability) without reducing significantly overall investment.

Suggested Citation

  • Aldasoro, Iñaki & Delli Gatti, Domenico & Faia, Ester, 2015. "Bank networks: Contagion, systemic risk and prudential policy," SAFE Working Paper Series 87, Leibniz Institute for Financial Research SAFE, revised 2015.
    • Handle: RePEc:zbw:safewp:87
    DOI: 10.2139/ssrn.2572877
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    References listed on IDEAS

    as
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    More about this item

    Keywords

    banking networks; systemic risk; contagion; fire sales; prudential regulation;
    All these keywords.

    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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