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(In)Efficient Interbank Networks

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  • Noémie NAVARRO
  • Fabio CASTIGLIONESI

Abstract

We study the optimality and the (decentralized) formation of an interbank network. Banks can offer higher expected returns to depositors by establishing connections in the network. However, banks have an incentive to gamble with depositors\' money if not sufficiently capitalized. The bankruptcy of a bank negatively affects the banks connected to it (counterparty risk). We show that both the efficient network and the decentralized one are characterized by a core-periphery structure. Nevertheless, when bank capital transfers are not possible, the two network structures coincide only if counterparty risk is sufficiently low. Otherwise, the decentralized network is under-connected as compared to the optimal one. Finally, we show that bank capital transfers do not avoid the formation of inefficient networks.

Suggested Citation

  • Noémie NAVARRO & Fabio CASTIGLIONESI, 2016. "(In)Efficient Interbank Networks," Cahiers du GREThA (2007-2019) 2016-13, Groupe de Recherche en Economie Théorique et Appliquée (GREThA).
    • Handle: RePEc:grt:wpegrt:2016-13
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    Cited by:

    1. in 't Veld, Daan & van der Leij, Marco & Hommes, Cars, 2020. "The formation of a core-periphery structure in heterogeneous financial networks," Journal of Economic Dynamics and Control, Elsevier, vol. 119(C).
    2. Biswas, Swarnava S. & Gómez, Fabiana, 2018. "Contagion through common borrowers," Journal of Financial Stability, Elsevier, vol. 39(C), pages 125-132.
    3. Brassil, Anthony & Nodari, Gabriela, 2021. "A Density-Based estimator of core/periphery network structures," Journal of Banking & Finance, Elsevier, vol. 125(C).
    4. Fittje, Jens & Wagner, Helmut, 2020. "Networking topography and default contagion in China’s financial system," CEAMeS Discussion Paper Series 17/2020, University of Hagen, Center for East Asia Macro-economic Studies (CEAMeS).
    5. in 't Veld, Daan & van der Leij, Marco & Hommes, Cars, 2020. "The formation of a core-periphery structure in heterogeneous financial networks," Journal of Economic Dynamics and Control, Elsevier, vol. 119(C).
    6. Di Xiao & Andreas Krause, 2023. "Balancing liquidity and returns through interbank markets: Endogenous interest rates and network structures," Journal of Financial Research, Southern Finance Association;Southwestern Finance Association, vol. 46(1), pages 131-149, February.
    7. Brunetti, Celso & Harris, Jeffrey H. & Mankad, Shawn, 2023. "Networks, interconnectedness, and interbank information asymmetry," Journal of Financial Stability, Elsevier, vol. 67(C).
    8. Choi, Seungho & Gam, Yong Kyu & Park, Junho & Shin, Hojong, 2020. "Bank partnership and liquidity crisis," Journal of Banking & Finance, Elsevier, vol. 120(C).
    9. Celso Brunetti & Jeffrey H. Harris & Shawn Mankad, 2021. "Liquidity Networks, Interconnectedness, and Interbank Information Asymmetry," Finance and Economics Discussion Series 2021-017, Board of Governors of the Federal Reserve System (U.S.).
    10. Kosenko, Konstantin & Michelson, Noam, 2022. "It takes more than two to tango: Multiple bank lending, asset commonality and risk," Journal of Financial Stability, Elsevier, vol. 61(C).
    11. Mario Eboli & Bulent Ozel & Andrea Teglio & Andrea Toto, 2023. "Connectivity, centralisation and ‘robustness-yet-fragility’ of interbank networks," Annals of Finance, Springer, vol. 19(2), pages 169-200, June.
    12. Morteza Alaeddini & Philippe Madiès & Paul J. Reaidy & Julie Dugdale, 2023. "Interbank money market concerns and actors’ strategies—A systematic review of 21st century literature," Journal of Economic Surveys, Wiley Blackwell, vol. 37(2), pages 573-654, April.

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    More about this item

    Keywords

    Interbank Network; Core-periphery; Liquidity Coinsurance; Counterparty Risk;
    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

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