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Is South Korea's stock market efficient? A note

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  • Abdul Rahman
  • Samir Saadi

Abstract

In an attempt to examine efficiency of South Korea's stock market (SKM), Narayan and Smyth (2004) used a battery of unit root tests to investigate the random walk hypothesis and on the basis of the reported evidence for unit root, they concluded that the SKM is efficient. The authors have unfortunately confused random walk with unit root hypothesis. The present note stresses the fact that it is insufficient to test for stationarity when examining efficiency, casting serious doubt on Narayan and Smyth's conclusions. Furthermore, we provide comments on the shortfalls of the unit roots tests employed and not accounted for in Narayan and Smyth's study which may lead to spurious results.

Suggested Citation

  • Abdul Rahman & Samir Saadi, 2007. "Is South Korea's stock market efficient? A note," Applied Economics Letters, Taylor & Francis Journals, vol. 14(1), pages 71-74.
    • Handle: RePEc:taf:apeclt:v:14:y:2007:i:1:p:71-74
    DOI: 10.1080/13504850500425659
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    References listed on IDEAS

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    2. Paresh Kumar Narayan & Russell Smyth, 2004. "Is South Korea's stock market efficient?," Applied Economics Letters, Taylor & Francis Journals, vol. 11(11), pages 707-710.
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    Cited by:

    1. Kian-Ping Lim & Muzafar Shah Habibullah & Melvin J. Hinich, 2009. "The Weak-form Efficiency of Chinese Stock Markets," Journal of Emerging Market Finance, Institute for Financial Management and Research, vol. 8(2), pages 133-163, May.

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