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Emergence of a core-periphery structure in a simple dynamic model of the interbank market

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  • Lux, Thomas

Abstract

This paper studies a simple dynamic model of interbank credit relationships. Starting from a given balance sheet structure of a banking system with a realistic distribution of bank sizes, the necessity of establishing interbank credit connections emerges from idiosyncratic liquidity shocks. Banks initially choose potential trading partners randomly, but over time form preferential relationships via an elementary reinforcement learning algorithm. As it turns out, the dynamic evolution of this system displays a formation of a core-periphery structure with mainly the largest banks assuming the roles of money center banks mediating between the liquidity needs of many smaller banks. Statistical analysis shows that this evolving interbank market shares the majority of the salient characteristics of interbank credit relationship that have been put forth in recent literature. Preferential interest rates for borrowers with strong attachment to a lender may prevent the system from becoming extortionary and guarantee the survival of the small peripherical banks.

Suggested Citation

  • Lux, Thomas, 2015. "Emergence of a core-periphery structure in a simple dynamic model of the interbank market," Journal of Economic Dynamics and Control, Elsevier, vol. 52(C), pages 11-23.
    • Handle: RePEc:eee:dyncon:v:52:y:2015:i:c:p:a11-a23
    DOI: 10.1016/j.jedc.2014.09.038
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    References listed on IDEAS

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    More about this item

    Keywords

    Liquidity; Interbank market; Network formation;
    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
    • D83 - Microeconomics - - Information, Knowledge, and Uncertainty - - - Search; Learning; Information and Knowledge; Communication; Belief; Unawareness

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