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African Emerging Equity Markets Re-examined: Testing the Weak Form Efficiency Theory

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  • Emmanuel O. Nwosu
  • Anthony Orji
  • Ogomegbunam Anagwu

Abstract

This paper examines the weak form of market efficiency of five major stock markets; four African equity markets and one developed market. The weekly market index returns of the EGX 30, NSE 20, NSE All Share Index, FTSE-JSE All Share Index and the S&P 500 Index were analysed for the period 1998–2008. To determine if the stylized fact of stock returns in African markets violate the random walk hypothesis, numerous econometric and statistical techniques are employed. These methods include the autocorrelation test, the unit test, linear and non-linear models. The results indicate that the African markets do not behave in a manner consistent with the weak form of market efficiency. These results provide a contrast between the emerging African markets and the developed markets. It suggests that African emerging markets have higher average returns and volatility than developed markets. We argue that if the market could be made less volatile, it has the potential to attract more investment because of its attractive returns.

Suggested Citation

  • Emmanuel O. Nwosu & Anthony Orji & Ogomegbunam Anagwu, 2013. "African Emerging Equity Markets Re-examined: Testing the Weak Form Efficiency Theory," African Development Review, African Development Bank, vol. 25(4), pages 485-498.
    • Handle: RePEc:adb:adbadr:2088
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    References listed on IDEAS

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    Cited by:

    1. David de Villiers & Natalya Apopo & Andrew Phiri & David McMillan, 2020. "Unobserved structural shifts and asymmetries in the random walk model for stock returns in African frontier markets," Cogent Economics & Finance, Taylor & Francis Journals, vol. 8(1), pages 1769348-176, January.
    2. Dong, Gang Nathan & Gu, Ming & He, Hua, 2020. "Invisible hand and helping hand: Private placement of public equity in China," Journal of Corporate Finance, Elsevier, vol. 61(C).
    3. Konstantinos Vergos & Benjamin Wanger, 2019. "Evaluating interdependencies in African markets A VECM approach," Bulletin of Applied Economics, Risk Market Journals, vol. 6(1), pages 65-85.
    4. Edward A. E. Jones & Anthony K. Kyiu & Hao Li, 2021. "Earnings informativeness and trading frequency: Evidence from African markets," International Journal of Finance & Economics, John Wiley & Sons, Ltd., vol. 26(1), pages 1064-1086, January.

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