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Banks' management of the net interest margin: Evidence from Germany

  • Memmel, Christoph
  • Schertler, Andrea

We decompose the change in banks' net interest margin into a change in market-wide bank rates and a change in the balance-sheet composition. Our empirical findings from a detailed data set on German banks' balance-sheet positions, broken down into different maturities, creditors and borrowers and degrees of liquidity are as follows: (i) Changes in bank rates have a much greater impact on and explain more of the variation in net interest margins than do changes in balance-sheet compositions. (ii) Changes in bank rates and changes in balance-sheet compositions affect the change in the net interest margin less strongly for derivative users than for non-users. On average, banks employ interest rate derivatives to reduce on-balance risk. (iii) When risk-taking becomes more lucrative, banks tend to increase their on-balance exposure. This effect is more pronounced for derivative users than for non-users.

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Paper provided by Deutsche Bundesbank, Research Centre in its series Discussion Paper Series 2: Banking and Financial Studies with number 2011,13.

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Date of creation: 2011
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Handle: RePEc:zbw:bubdp2:201113
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  1. Elijah Brewer, III & Bernadette A. Minton & James T. Moser, 1996. "Interest-rate derivatives and bank lending," Working Paper Series, Macroeconomic Issues WP-96-13, Federal Reserve Bank of Chicago.
  2. Christoph Memmel, 2008. "Which interest rate scenario is the worst one for a bank? Evidence from a tracking bank approach for German savings and cooperative banks," International Journal of Banking, Accounting and Finance, Inderscience Enterprises Ltd, vol. 1(1), pages 85-104.
  3. Dawood Ashraf & Yener Altunbas & John Goddard, 2007. "Who Transfers Credit Risk? Determinants of the Use of Credit Derivatives by Large US Banks," The European Journal of Finance, Taylor & Francis Journals, vol. 13(5), pages 483-500.
  4. Kit, Pong Wong, 1997. "On the determinants of bank interest margins under credit and interest rate risks," Journal of Banking & Finance, Elsevier, vol. 21(2), pages 251-271, February.
  5. Elijah Brewer, III & William E. Jackson, III & James T. Moser, 2001. "The value of using interest rate derivatives to manage risk of U.S. banking organizations," Economic Perspectives, Federal Reserve Bank of Chicago, issue Q III, pages 49-66.
  6. Stulz, René M., 1984. "Optimal Hedging Policies," Journal of Financial and Quantitative Analysis, Cambridge University Press, vol. 19(02), pages 127-140, June.
  7. Memmel, Christoph, 2011. "Banks' exposure to interest rate risk, their earnings from term transformation, and the dynamics of the term structure," Journal of Banking & Finance, Elsevier, vol. 35(2), pages 282-289, February.
  8. Maudos, Joaquin & Fernandez de Guevara, Juan, 2003. "Factors Explaining the Interest Margin in the Banking Sectors of the European Union," MPRA Paper 15252, University Library of Munich, Germany.
  9. Memmel, Christoph & Schertler, Andrea, 2009. "The dependency of the banks' assets and liabilities: evidence from Germany," Discussion Paper Series 2: Banking and Financial Studies 2009,14, Deutsche Bundesbank, Research Centre.
  10. Purnanandam, Amiyatosh, 2007. "Interest rate derivatives at commercial banks: An empirical investigation," Journal of Monetary Economics, Elsevier, vol. 54(6), pages 1769-1808, September.
  11. Kasman, Adnan & Tunc, Gokce & Vardar, Gulin & Okan, Berna, 2010. "Consolidation and commercial bank net interest margins: Evidence from the old and new European Union members and candidate countries," Economic Modelling, Elsevier, vol. 27(3), pages 648-655, May.
  12. 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(04), pages 581-600, November.
  13. David Carter & Joseph Sinkey, 1998. "The Use of Interest Rate Derivatives by End-users: The Case of Large Community Banks," Journal of Financial Services Research, Springer, vol. 14(1), pages 17-34, July.
  14. Delis, Manthos D. & Kouretas, Georgios P., 2011. "Interest rates and bank risk-taking," Journal of Banking & Finance, Elsevier, vol. 35(4), pages 840-855, April.
  15. White, Halbert, 1980. "A Heteroskedasticity-Consistent Covariance Matrix Estimator and a Direct Test for Heteroskedasticity," Econometrica, Econometric Society, vol. 48(4), pages 817-38, May.
  16. Christoph Memmel & Ingrid Stein, 2008. "European Data Watch: The Deutsche Bundesbank’s prudential database (BAKIS)," Schmollers Jahrbuch : Journal of Applied Social Science Studies / Zeitschrift für Wirtschafts- und Sozialwissenschaften, Duncker & Humblot, Berlin, vol. 128(2), pages 321-328.
  17. Lerner, Eugene M., 1981. "Discussion: The Determinants of Bank Interest Margins: Theory and Empirical Evidence," Journal of Financial and Quantitative Analysis, Cambridge University Press, vol. 16(04), pages 601-602, November.
  18. DeYoung, Robert & Yom, Chiwon, 2008. "On the independence of assets and liabilities: Evidence from U.S. commercial banks, 1990-2005," Journal of Financial Stability, Elsevier, vol. 4(3), pages 275-303, September.
  19. Saunders, Anthony & Schumacher, Liliana, 2000. "The determinants of bank interest rate margins: an international study," Journal of International Money and Finance, Elsevier, vol. 19(6), pages 813-832, December.
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