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Liquidity And The Informational Efficiency Of African Stock Markets

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  • Graham Smith

Abstract

The hypothesis that a stock market price index follows a random walk is tested for 11 African stock markets, Botswana, Côte d'Ivoire, Egypt, Ghana, Kenya, Mauritius, Morocco, Nigeria, South Africa, Tunisia and Zimbabwe using joint variance ratio tests with finite-sample critical values, over the period beginning in January 2000 and ending in September 2006. The iid random walk hypothesis is rejected in all 11 markets. In four stock markets, Egypt, Nigeria, Tunisia and South Africa, weekly returns are a martingale difference sequence. Liquidity is an important factor which contributes to whether a stock market follows a random walk. Copyright (c) 2008 The Author. Journal compilation (c) 2008 Economic Society of South Africa.

Suggested Citation

  • Graham Smith, 2008. "Liquidity And The Informational Efficiency Of African Stock Markets," South African Journal of Economics, Economic Society of South Africa, vol. 76(2), pages 161-175, June.
  • Handle: RePEc:bla:sajeco:v:76:y:2008:i:2:p:161-175
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    References listed on IDEAS

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    1. Kim, Jae H. & Shamsuddin, Abul, 2008. "Are Asian stock markets efficient? Evidence from new multiple variance ratio tests," Journal of Empirical Finance, Elsevier, vol. 15(3), pages 518-532, June.
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    4. M. Magnusson & B. Wydick, 2002. "How Efficient are Africa's Emerging Stock Markets?," Journal of Development Studies, Taylor & Francis Journals, vol. 38(4), pages 141-156.
    5. Graham Smith & Keith Jefferis & Hyun-Jung Ryoo, 2002. "African stock markets: multiple variance ratio tests of random walks," Applied Financial Economics, Taylor & Francis Journals, vol. 12(7), pages 475-484.
    6. Steve Lawford, 2005. "Finite-sample quantiles of the Jarque-Bera test," Applied Economics Letters, Taylor & Francis Journals, vol. 12(6), pages 351-354.
    7. Keith Jefferis & Graham Smith, 2004. "Capitalisation And Weak-Form Efficiency In The Jse Securities Exchange," South African Journal of Economics, Economic Society of South Africa, vol. 72(4), pages 684-707, September.
    8. Wright, Jonathan H, 2000. "Alternative Variance-Ratio Tests Using Ranks and Signs," Journal of Business & Economic Statistics, American Statistical Association, vol. 18(1), pages 1-9, January.
    9. Karemera, David & Ojah, Kalu & Cole, John A, 1999. "Random Walks and Market Efficiency Tests: Evidence from Emerging Equity Markets," Review of Quantitative Finance and Accounting, Springer, vol. 13(2), pages 171-188, September.
    10. Chipo Mlambo & Nicholas Biekpe & Eon Smit, 2003. "Testing the Random Walk Hypothesis on Thinly-Traded Markets: The Case of Four African Stock Markets," The African Finance Journal, Africagrowth Institute, vol. 5(1), pages 16-35.
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    12. Fama, Eugene F, 1970. "Efficient Capital Markets: A Review of Theory and Empirical Work," Journal of Finance, American Finance Association, vol. 25(2), pages 383-417, May.
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    14. Keith Jefferis & Graham Smith, 2005. "The Changing Efficiency Of African Stock Markets," South African Journal of Economics, Economic Society of South Africa, vol. 73(1), pages 54-67, March.
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    Cited by:

    1. Mensah, Justice T. & Pomaa-Berko, Maame & Adom, Philip Kofi, 2012. "Does Automation Improve Stock Market Efficiency? Evidence from Ghana," MPRA Paper 43642, University Library of Munich, Germany.
    2. Graham Smith & Aneta Dyakova, 2014. "African Stock Markets: Efficiency and Relative Predictability," South African Journal of Economics, Economic Society of South Africa, vol. 82(2), pages 258-275, June.
    3. Amira Akl Ahmed, 2014. "Evolving and relative efficiency of MENA stock markets: evidence from rolling joint variance ratio tests," Ensayos Revista de Economia, Universidad Autonoma de Nuevo Leon, Facultad de Economia, vol. 0(1), pages 91-126, May.
    4. repec:eee:phsmap:v:505:y:2018:i:c:p:680-687 is not listed on IDEAS

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