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Size, Efficiency, Market Power, and Economies of Scale in the African Banking Sector

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  • Asongu, Simplice
  • Odhiambo, Nicholas

Abstract

There is a growing body of evidence that interest rate spreads in Africa are higher for big banks compared to small banks. One concern is that big banks might be using their market power to charge higher lending rates as they become larger, more efficient, and unchallenged. In contrast, several studies found that when bank size increases beyond certain thresholds, diseconomies of scale are introduced that lead to inefficiency. In that case, we also would expect to see widened interest margins. This study examines the connection between bank size and efficiency to understand whether that relationship is influenced by exploitation of market power or economies of scale. Using a panel of 162 African banks for 2001–2011, we analyzed the empirical data using instrumental variables and fixed effects regressions, with overlapping and non-overlapping thresholds for bank size. We found two key results. First, bank size increases bank interest rate margins with an inverted U-shaped nexus. Second, market power and economies of scale do not increase or decrease the interest rate margins significantly. The main policy implication is that interest rate margins cannot be elucidated by either market power or economies of scale. Other implications are discussed.

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  • Asongu, Simplice & Odhiambo, Nicholas, 2018. "Size, Efficiency, Market Power, and Economies of Scale in the African Banking Sector," MPRA Paper 92347, University Library of Munich, Germany.
  • Handle: RePEc:pra:mprapa:92347
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    as
    1. Saeed Al-Muharrami & Kent Matthews, 2009. "Market power versus efficient-structure in Arab GCC banking," Applied Financial Economics, Taylor & Francis Journals, vol. 19(18), pages 1487-1496.
    2. Vanessa Tchamyou, 2018. "Education, Lifelong learning, Inequality and Financial access: Evidence from African countries," Working Papers of the African Governance and Development Institute. 18/003, African Governance and Development Institute..
    3. Paolo Coccorese & Alfonso Pellecchia, 2010. "Testing the ‘Quiet Life’ Hypothesis in the Italian Banking Industry," Economic Notes, Banca Monte dei Paschi di Siena SpA, vol. 39(3), pages 173-202, November.
    4. Boateng, Agyenim & Asongu, Simplice & Akamavi, Raphael & Tchamyou, Vanessa, 2018. "Information asymmetry and market power in the African banking industry," Journal of Multinational Financial Management, Elsevier, vol. 44(C), pages 69-83.
    5. Rhoades, Stephen A., 1998. "The efficiency effects of bank mergers: An overview of case studies of nine mergers," Journal of Banking & Finance, Elsevier, vol. 22(3), pages 273-291, March.
    6. Holger Floerkemeier & Era Dabla-Norris, 2007. "Bank Efficiency and Market Structure; What Determines Banking Spreads in Armenia?," IMF Working Papers 07/134, International Monetary Fund.
    7. repec:spr:fininn:v:2:y:2016:i:1:d:10.1186_s40854-016-0043-8 is not listed on IDEAS
    8. Michael Koetter & James Kolari, 2008. "Testing the quiet life of U.S. banks with adjusted Lerner indices," Proceedings 1094, Federal Reserve Bank of Chicago.
    9. Simplice A. Asongu, 2013. "Investment And Inequality In Africa: Which Financial Channels Are Good For The Poor?," The African Finance Journal, Africagrowth Institute, vol. 15(2), pages 43-65.
    10. repec:taf:wjabxx:v:18:y:2017:i:1:p:70-101 is not listed on IDEAS
    11. repec:taf:wjabxx:v:18:y:2017:i:2:p:143-168 is not listed on IDEAS
    12. Berger, Allen N. & Mester, Loretta J., 1997. "Inside the black box: What explains differences in the efficiencies of financial institutions?," Journal of Banking & Finance, Elsevier, vol. 21(7), pages 895-947, July.
    13. repec:eme:ajempp:ajems-03-2017-146 is not listed on IDEAS
    14. Adrian Blundell-Wignall & Paul Atkinson, 2010. "Thinking beyond Basel III: Necessary Solutions for Capital and Liquidity," OECD Journal: Financial Market Trends, OECD Publishing, vol. 2010(1), pages 9-33.
    15. repec:eme:ajempp:ajems-03-2017-144 is not listed on IDEAS
    16. Peristiani, Stavros, 1997. "Do Mergers Improve the X-Efficiency and Scale Efficiency of U.S. Banks? Evidence from the 1980s," Journal of Money, Credit and Banking, Blackwell Publishing, vol. 29(3), pages 326-337, August.
    17. Asongu, Simplice A., 2017. "The effect of reducing information asymmetry on loan price and quantity in the African banking industry," Research in International Business and Finance, Elsevier, vol. 41(C), pages 185-197.
    18. Mitchell, Karlyn & Onvural, Nur M, 1996. "Economies of Scale and Scope at Large Commercial Banks: Evidence from the Fourier Flexible Functional Form," Journal of Money, Credit and Banking, Blackwell Publishing, vol. 28(2), pages 178-199, May.
    19. Solís, Liliana & Maudos, Joaquín, 2008. "The social costs of bank market power: Evidence from Mexico," Journal of Comparative Economics, Elsevier, vol. 36(3), pages 467-488, September.
    20. Beck, Thorsten & Hesse, Heiko, 2006. "Bank efficiency, ownership, and market structure : why are interest spreads so high in Uganda ?," Policy Research Working Paper Series 4027, The World Bank.
    21. Babajide Fowowe, 2014. "Law and Finance Revisited: Evidence from African Countries," South African Journal of Economics, Economic Society of South Africa, vol. 82(2), pages 193-208, June.
    22. Vanessa S. Tchamyou & Simplice A. Asongu, 2017. "Information Sharing and Financial Sector Development in Africa," Journal of African Business, Taylor & Francis Journals, vol. 18(1), pages 24-49, January.
    23. Clark, Jeffrey A, 1996. "Economic Cost, Scale Efficiency, and Competitive Viability in Banking," Journal of Money, Credit and Banking, Blackwell Publishing, vol. 28(3), pages 342-364, August.
    24. repec:bla:afrdev:v:29:y:2017:i:2:p:293-304 is not listed on IDEAS
    25. repec:eee:ejores:v:270:y:2018:i:2:p:747-760 is not listed on IDEAS
    26. repec:wsi:ijfexx:v:04:y:2017:i:02n03:n:s242478631750027x is not listed on IDEAS
    27. Simplice Asongu & Sara le Roux, 2018. "Understanding Sub-Saharan Africa’s Extreme Poverty Tragedy," Working Papers of the African Governance and Development Institute. 18/012, African Governance and Development Institute..
    28. Anginer, Deniz & Demirguc-Kunt, Asli & Zhu, Min, 2014. "How does competition affect bank systemic risk?," Journal of Financial Intermediation, Elsevier, vol. 23(1), pages 1-26.
    29. repec:eee:riibaf:v:42:y:2017:i:c:p:1123-1136 is not listed on IDEAS
    30. Sameh Charfeddine Karray & Jamel eddine Chichti, 2013. "Bank Size and Efficiency in Developing Countries: Intermediation Approach versus Value Added Approach and Impact of Non-Traditional Activities," Asian Economic and Financial Review, Asian Economic and Social Society, vol. 3(5), pages 593-613, May.
    31. Noulas, Athanasios G & Ray, Subhash C & Miller, Stephen M, 1990. "Returns to Scale and Input Substitution for Large U.S. Banks," Journal of Money, Credit and Banking, Blackwell Publishing, vol. 22(1), pages 94-108, February.
    32. Lang, Gunter & Welzel, Peter, 1996. "Efficiency and technical progress in banking Empirical results for a panel of German cooperative banks," Journal of Banking & Finance, Elsevier, vol. 20(6), pages 1003-1023, July.
    33. Simplice A. Asongu & Nicholas M. Odhiambo, 2019. "Testing the Quiet Life Hypothesis in the African Banking Industry," Journal of Industry, Competition and Trade, Springer, vol. 19(1), pages 69-82, March.
    34. Anca Pruteanu-Podpiera & Franziska Schobert & Laurent Weill, 2008. "Banking competition and cost efficiency: a micro-data analysis on the Czech banking industry," ULB Institutional Repository 2013/14307, ULB -- Universite Libre de Bruxelles.
    35. Anca Pruteanu-Podpiera & Laurent Weill & Franziska Schobert, 2008. "Banking Competition and Efficiency: A Micro-Data Analysis on the Czech Banking Industry," Comparative Economic Studies, Palgrave Macmillan;Association for Comparative Economic Studies, vol. 50(2), pages 253-273, June.
    36. Berger, Allen N. & Hanweck, Gerald A. & Humphrey, David B., 1987. "Competitive viability in banking : Scale, scope, and product mix economies," Journal of Monetary Economics, Elsevier, vol. 20(3), pages 501-520, December.
    37. Rayna Brown & Ian O'Connor, 1995. "Measurement of Economies of Scale in Victorian Credit Unions," Australian Journal of Management, Australian School of Business, vol. 20(1), pages 1-24, June.
    38. Delis, Manthos D. & Tsionas, Efthymios G., 2009. "The joint estimation of bank-level market power and efficiency," Journal of Banking & Finance, Elsevier, vol. 33(10), pages 1842-1850, October.
    39. Calixte Ahokpossi, 2013. "Determinants of Bank Interest Margins in Sub-Saharan Africa," IMF Working Papers 13/34, International Monetary Fund.
    40. Asongu, Simplice A. & Biekpe, Nicholas, 2018. "ICT, information asymmetry and market power in African banking industry," Research in International Business and Finance, Elsevier, vol. 44(C), pages 518-531.
    41. Vanessa S. Tchamyou & Simplice A. Asongu & Jacinta Nwachukwu, 2018. "Effects of asymmetric information on market timing in the mutual fund industry," Research Africa Network Working Papers 18/007, Research Africa Network (RAN).
    42. Thouraya Triki & Ousman Gajigo, 2014. "Credit Bureaus and Registration and Access to Finance: New Evidence from 42 African Countries," Journal of African Development, African Finance and Economic Association (AFEA), vol. 16(2), pages 73-101.
    43. Mester, Loretta J., 1992. "Traditional and nontraditional banking: An information-theoretic approach," Journal of Banking & Finance, Elsevier, vol. 16(3), pages 545-566, June.
    44. Asongu, Simplice & Batuo, Enowbi & Nwachukwu, Jacinta & Tchamyou, Vanessa, 2018. "Is information diffusion a threat to market power for financial access? Insights from the African banking industry," Journal of Multinational Financial Management, Elsevier, vol. 45(C), pages 88-104.
    45. Simplice A. Asongu & Nicholas M. Odhiambo, 2019. "Testing the Quiet Life Hypothesis in the African Banking Industry," Journal of Industry, Competition and Trade, Springer, vol. 19(1), pages 69-82, March.
    46. repec:taf:wjabxx:v:18:y:2017:i:2:p:257-277 is not listed on IDEAS
    47. Simplice A. Asongu & Sara le Roux, 2018. "Understanding Sub-Saharan Africa’s Extreme Poverty Tragedy," Research Africa Network Working Papers 18/012, Research Africa Network (RAN).
    48. Vanessa S. Tchamyou, 2019. "The Role of Information Sharing in Modulating the Effect of Financial Access on Inequality," Journal of African Business, Taylor & Francis Journals, vol. 20(3), pages 317-338, July.
    49. repec:bla:sajeco:v:85:y:2017:i:4:p:570-588 is not listed on IDEAS
    50. Paolo Coccorese, 2014. "Estimating the Lerner index for the banking industry: a stochastic frontier approach," Applied Financial Economics, Taylor & Francis Journals, vol. 24(2), pages 73-88, January.
    51. Allen, Linda & Rai, Anoop, 1996. "Operational efficiency in banking: An international comparison," Journal of Banking & Finance, Elsevier, vol. 20(4), pages 655-672, May.
    52. Tsionas, Efthymios G. & Malikov, Emir & Kumbhakar, Subal C., 2018. "An internally consistent approach to the estimation of market power and cost efficiency with an application to U.S. banking," European Journal of Operational Research, Elsevier, vol. 270(2), pages 747-760.
    53. repec:eme:ajempp:ajems-01-2016-0007 is not listed on IDEAS
    54. Turk Ariss, Rima, 2010. "On the implications of market power in banking: Evidence from developing countries," Journal of Banking & Finance, Elsevier, vol. 34(4), pages 765-775, April.
    55. repec:spr:fininn:v:4:y:2018:i:1:d:10.1186_s40854-018-0088-y is not listed on IDEAS
    56. Schaeck, Klaus & Čihák, Martin, 2008. "How does competition affect efficiency and soundness in banking? New empirical evidence," Working Paper Series 932, European Central Bank.
    57. McDonald, John, 2009. "Using least squares and tobit in second stage DEA efficiency analyses," European Journal of Operational Research, Elsevier, vol. 197(2), pages 792-798, September.
    58. Altunbas, Yener & Liu, Ming-Hau & Molyneux, Philip & Seth, Rama, 2000. "Efficiency and risk in Japanese banking," Journal of Banking & Finance, Elsevier, vol. 24(10), pages 1605-1628, October.
    59. Goldberg, Lawrence G. & Rai, Anoop, 1996. "The structure-performance relationship for European banking," Journal of Banking & Finance, Elsevier, vol. 20(4), pages 745-771, May.
    60. Subal Kumbhakar & Sjur Baardsen & Gudbrand Lien, 2012. "A New Method for Estimating Market Power with an Application to Norwegian Sawmilling," Review of Industrial Organization, Springer;The Industrial Organization Society, vol. 40(2), pages 109-129, March.
    61. repec:taf:wjabxx:v:17:y:2016:i:1:p:52-68 is not listed on IDEAS
    62. repec:wsi:rpbfmp:v:03:y:2000:i:04:n:s0219091500000236 is not listed on IDEAS
    63. Beck, Thorsten & Demirguc-Kunt, Asli & Levine, Ross, 1999. "A new database on financial development and structure," Policy Research Working Paper Series 2146, The World Bank.
    64. repec:eme:ajempp:ajems-03-2017-145 is not listed on IDEAS
    65. repec:wsi:ijfexx:v:04:y:2017:i:02n03:n:s2424786317500062 is not listed on IDEAS
    66. Chortareas, Georgios E. & Garza-García, Jesús G. & Girardone, Claudia, 2012. "Competition, efficiency and interest rate margins in Latin American banking," International Review of Financial Analysis, Elsevier, vol. 24(C), pages 93-103.
    67. repec:taf:wjabxx:v:17:y:2016:i:3:p:308-318 is not listed on IDEAS
    68. Wagenvoort, Rien & Schure, Paul, 1999. "Economies of Scale and Efficiency in European Banking: New Evidence," Economic and Financial Reports 1999/1, European Investment Bank, Economics Department.
    69. Fu, Xiaoqing (Maggie) & Heffernan, Shelagh, 2009. "The effects of reform on China's bank structure and performance," Journal of Banking & Finance, Elsevier, vol. 33(1), pages 39-52, January.
    70. Fethi, Meryem Duygun & Pasiouras, Fotios, 2010. "Assessing bank efficiency and performance with operational research and artificial intelligence techniques: A survey," European Journal of Operational Research, Elsevier, vol. 204(2), pages 189-198, July.
    71. repec:wly:ijfiec:v:23:y:2018:i:1:p:19-28 is not listed on IDEAS
    72. Maudos, Joaquin & de Guevara, Juan Fernandez, 2007. "The cost of market power in banking: Social welfare loss vs. cost inefficiency," Journal of Banking & Finance, Elsevier, vol. 31(7), pages 2103-2125, July.
    73. repec:eme:ajempp:ajems-03-2017-148 is not listed on IDEAS
    74. repec:eme:ajempp:ajems-12-2015-0143 is not listed on IDEAS
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    Keywords

    Sub-Saharan Africa; banks; lending rates; efficiency; Quiet Life Hypothesis; competition;

    JEL classification:

    • E42 - Macroeconomics and Monetary Economics - - Money and Interest Rates - - - Monetary Sytsems; Standards; Regimes; Government and the Monetary System
    • E52 - Macroeconomics and Monetary Economics - - Monetary Policy, Central Banking, and the Supply of Money and Credit - - - Monetary Policy
    • E58 - Macroeconomics and Monetary Economics - - Monetary Policy, Central Banking, and the Supply of Money and Credit - - - Central Banks and Their Policies
    • G21 - Financial Economics - - Financial Institutions and Services - - - Banks; Other Depository Institutions; Micro Finance Institutions; Mortgages
    • G28 - Financial Economics - - Financial Institutions and Services - - - Government Policy and Regulation

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