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Bank Diversity and Financial Contagion

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Abstract

This paper analyzes financial contagion in a banking system where banks are linked by interbank claims and common assets. We find that asset commonality makes banking systems more vulnerable to idiosyncratic shocks and helps to determine which interbank network structures are resistant to contagion. When the degree of commonality is homogeneous across banks, the most resilient structure is the complete interbank network in which each bank borrows evenly from all the others. However, when the bank most exposed to the defaulting bank is not the one whose portfolio is most similar to it, incomplete interbank networks are more resilient than complete. We also show that the degree and variability of asset commonality between banks and the way this intertwines with the cross-holdings of interbank deposits have important implications for macroprudential regulation.

Suggested Citation

  • Emmanuel Caiazzo & Alberto Zazzaro, 2023. "Bank Diversity and Financial Contagion," CSEF Working Papers 667, Centre for Studies in Economics and Finance (CSEF), University of Naples, Italy.
  • Handle: RePEc:sef:csefwp:667
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    More about this item

    Keywords

    Banking crisis; financial contagion; interbank network; asset commonality.;
    All these keywords.

    JEL classification:

    • G01 - Financial Economics - - General - - - Financial Crises
    • 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

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