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Clustering and Banking Interconnectivity: Identification of Contagion Channels in ECOWAS

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  • Abdoulaye Soumaila

Abstract

This paper analyzes the interconnectivity of banks in the Economic Community of West African States (ECOWAS) and identifies potential channels of contagion. From a sample of 120 banks covering the period 2001-2023, we use the K-means clustering algorithm to form homogeneous groups of banks with similar risk profiles. The results reveal the existence of ten distinct clusters, with banks in Ghana and Nigeria appearing as interconnected central nodes with several clusters. WAEMU banks have an average probability of default (PoD) of 9.9%, significantly lower than that of banks in the West African Monetary Zone (WAMZ) which reaches 20.7%. Moroccan banks, although foreign to the region, contribute less to systemic risk (PoD of 6.5%) than local banks. The study highlights that interbank debt acts as a moderator of systemic risk, with a significant negative relationship to the lower quantiles of the distribution. These results argue for enhanced cooperation between banking supervisors in the region.

Suggested Citation

  • Abdoulaye Soumaila, 2026. "Clustering and Banking Interconnectivity: Identification of Contagion Channels in ECOWAS," International Journal of Economics and Finance, Canadian Center of Science and Education, vol. 18(7), pages 1-72, July.
    • Handle: RePEc:ibn:ijefaa:v:18:y:2026:i:7:p:72
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    References listed on IDEAS

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    1. Billio, Monica & Getmansky, Mila & Lo, Andrew W. & Pelizzon, Loriana, 2012. "Econometric measures of connectedness and systemic risk in the finance and insurance sectors," Journal of Financial Economics, Elsevier, vol. 104(3), pages 535-559.
    2. Cocco, João F. & Gomes, Francisco J. & Martins, Nuno C., 2009. "Lending relationships in the interbank market," Journal of Financial Intermediation, Elsevier, vol. 18(1), pages 24-48, January.
    3. Iori, Giulia & Jafarey, Saqib & Padilla, Francisco G., 2006. "Systemic risk on the interbank market," Journal of Economic Behavior & Organization, Elsevier, vol. 61(4), pages 525-542, December.
    4. Ingo Fender & Patrick McGuire, 2010. "Bank structure, funding risk and the transmission of shocks across countries: concepts and measurement," BIS Quarterly Review, Bank for International Settlements, September.
    5. Larry Eisenberg & Thomas H. Noe, 2001. "Systemic Risk in Financial Systems," Management Science, INFORMS, vol. 47(2), pages 236-249, February.
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    JEL classification:

    • R00 - Urban, Rural, Regional, Real Estate, and Transportation Economics - - General - - - General
    • Z0 - Other Special Topics - - General

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