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Single-name concentration risk in credit portfolios: a comparison of concentration indices

Author

Listed:
  • Raffaella Calabrese

    (University College Dublin)

  • Francesco Porro

    (Universit`a degli Studi di Milano-Bicocca)

Abstract

For assessing the effect of undiversified idiosyncratic risk, Basel II has established that banks should measure and control their credit concentration risk. Concentration risk in credit portfolios comes into being through an uneven distribution of bank loans to individual borrowers (single-name concentration) or through an unbalanced allocation of loans in productive sectors and geographical regions (sectoral concentration). To evaluate single-name concentration risk in the literature concentration indices proposed in welfare (Gini Index) and monopoly theory (Herfindahl- Hirschman index, Theil entropy index, Hannah-Kay index, Hall-Tidemann index) have been used. In this paper such concentration indices are compared by using as benchmark six properties that ensure a consistent measurement of single-name concentration. Finally, the indices are compared on some portfolios of loans.

Suggested Citation

  • Raffaella Calabrese & Francesco Porro, 2012. "Single-name concentration risk in credit portfolios: a comparison of concentration indices," Working Papers 201214, Geary Institute, University College Dublin.
    • Handle: RePEc:ucd:wpaper:201214
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    References listed on IDEAS

    as
    1. Leslie Hannah & J. A. Kay, 1977. "Concentration in Modern Industry," Palgrave Macmillan Books, Palgrave Macmillan, number 978-1-349-02773-6, December.
    2. Gordy, Michael B., 2003. "A risk-factor model foundation for ratings-based bank capital rules," Journal of Financial Intermediation, Elsevier, vol. 12(3), pages 199-232, July.
    3. Encaoua, David & Jacquemin, Alexis, 1980. "Degree of Monopoly, Indices of Concentration and Threat of Entry," International Economic Review, Department of Economics, University of Pennsylvania and Osaka University Institute of Social and Economic Research Association, vol. 21(1), pages 87-105, February.
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    Cited by:

    1. Jan Kluge, 2018. "Sectoral diversification as insurance against economic instability," Journal of Regional Science, Wiley Blackwell, vol. 58(1), pages 204-223, January.

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    Keywords

    credit concentration risk; bank loans; single-name concentration;
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