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What determines the interest margin? An analysis of the German banking system

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  • Karmann, Alexander
  • Bühn, Andreas
  • Pedrotti, Marco

Abstract

This paper analyzes the determinants of the interest margin of German banks over the period 1995-2007, explicitly addressing differences among different bank groups. We use three empirical models to focus on the following aspects: the time evolution of the interest margin, the average differences across groups, and the presence of autoregressive effects. For each model our results show that the interest margin can be mainly explained by market power and inefficiency, the influence of which is particularly high for cooperative banks. The Winner s Curse phenomenon and the cross-subsidization strategy negatively influence the margin of private banks.

Suggested Citation

  • Karmann, Alexander & Bühn, Andreas & Pedrotti, Marco, 2013. "What determines the interest margin? An analysis of the German banking system," VfS Annual Conference 2013 (Duesseldorf): Competition Policy and Regulation in a Global Economic Order 80029, Verein für Socialpolitik / German Economic Association.
    • Handle: RePEc:zbw:vfsc13:80029
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    References listed on IDEAS

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    1. Lepetit, Laetitia & Nys, Emmanuelle & Rous, Philippe & Tarazi, Amine, 2008. "The expansion of services in European banking: Implications for loan pricing and interest margins," Journal of Banking & Finance, Elsevier, vol. 32(11), pages 2325-2335, November.
    2. Zarruk, Emilio R., 1989. "Bank spread with uncertain deposit level and risk aversion," Journal of Banking & Finance, Elsevier, vol. 13(6), pages 797-810, December.
    3. Ho, Thomas S. Y. & Saunders, Anthony, 1981. "The Determinants of Bank Interest Margins: Theory and Empirical Evidence," Journal of Financial and Quantitative Analysis, Cambridge University Press, vol. 16(4), pages 581-600, November.
    4. Zarruk, Emilio R. & Madura, Jeff, 1992. "Optimal Bank Interest Margin under Capital Regulation and Deposit Insurance," Journal of Financial and Quantitative Analysis, Cambridge University Press, vol. 27(1), pages 143-149, March.
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    Cited by:

    1. Maurer Thomas & Thießen Friedrich, 2018. "Genossenschaftsbanken im ländlichen und städtischen Raum: Effizienzunterschiede und optimale Betriebsgrößen," Zeitschrift für das gesamte Genossenschaftswesen, De Gruyter, vol. 68(1), pages 5-27, March.

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    More about this item

    JEL classification:

    • G21 - Financial Economics - - Financial Institutions and Services - - - Banks; Other Depository Institutions; Micro Finance Institutions; Mortgages
    • G21 - Financial Economics - - Financial Institutions and Services - - - Banks; Other Depository Institutions; Micro Finance Institutions; Mortgages
    • G21 - Financial Economics - - Financial Institutions and Services - - - Banks; Other Depository Institutions; Micro Finance Institutions; Mortgages

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