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Market Efficiency In G-20 Countries: The Paradox Of Financial Crisis

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  • JOÃO PAULO VIEITO

    (School of Business Studies, Polytechnic Institute of Viana do Castelo, Avenida Miguel Dantas, 4930 Valença, Portugal)

  • K. V. BHANU MURTHY

    (Delhi School of Economics, Delhi University, Cavalry Lane, Near Vishwavidhyalaya Metro Station, New Delhi, DL 110007, India)

  • VANITA TRIPATHI

    (Delhi School of Economics, Delhi University, Cavalry Lane, Near Vishwavidhyalaya Metro Station, New Delhi, DL 110007, India)

Abstract

This paper is amongst the first to investigate weak-form efficiency of the most developed (G-20) countries in the world. It also measures the impact of the 2007 financial crisis on the stock markets of these countries, in terms of their efficiency. Serial correlation test, ADF unit root test, Lo and MacKinlay (1988) variance ratio test, Chow and Denning (1993) RWH test and Wrights' 2000 ranks and signs based multiple variance ratio test were utilized to carry out this analysis. The entire study period was divided into a pre-crisis period (January 1, 2005 – August 8, 2007) and a during crisis period (August 9, 2007 – Deccember 31, 2011). Strong contemporaneous effects emerged across all international markets (except Saudi Arabia) as a consequence of the 2007 crisis. This may be due to increased international intra-day activity across the world markets. It was concluded that the "Samuelson dictum," which states that "while individual stocks are efficient, the market index is inefficient," seems to hold good on a global level by analogy. This is evident on the premise that, on the whole the 2007 crisis reduced return and increased volatility, even though individual markets became more efficient. The most robust result from the analysis is that most of the individual markets are weak-form efficient. Following the crisis of 2007, the methodology used indicates that on the whole, the market efficiency of individual stock markets improved.Hence, during the pre-crisis, volatility was low but heteroskedastic. However, during the period of the crisis, volatility was high but homoscedastic. The heightened volatility and low return that are a consequence of the crisis coupled with improved market efficiency, due to market vigil and control, ensure that abnormal returns and persistent arbitrage possibilities are wiped out. This appears to be a paradox of a crisis.

Suggested Citation

  • João Paulo Vieito & K. V. Bhanu Murthy & Vanita Tripathi, 2013. "Market Efficiency In G-20 Countries: The Paradox Of Financial Crisis," Annals of Financial Economics (AFE), World Scientific Publishing Co. Pte. Ltd., vol. 8(01), pages 1-27.
  • Handle: RePEc:wsi:afexxx:v:08:y:2013:i:01:n:s2010495213500036
    DOI: 10.1142/S2010495213500036
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    References listed on IDEAS

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    1. Andrew C. Worthington & Helen Higgs, 2003. "Tests of random walks and market efficiency in Latin American stock markets: An empirical note," School of Economics and Finance Discussion Papers and Working Papers Series 157, School of Economics and Finance, Queensland University of Technology.
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    Cited by:

    1. Saker Sabkha & Christian Peretti & Dorra Hmaied, 2019. "On the informational market efficiency of the worldwide sovereign credit default swaps," Journal of Asset Management, Palgrave Macmillan, vol. 20(7), pages 581-608, December.
    2. Srilakshminarayana G, 2021. "Tail Behaviour of the Nifty-50 Stocks during Crises Periods," Advances in Decision Sciences, Asia University, Taiwan, vol. 25(4), pages 115-151, December.
    3. Tai-Yuen Hon & Massoud Moslehpour & Kai-Yin Woo, 2021. "Review on Behavioral Finance with Empirical Evidence," Advances in Decision Sciences, Asia University, Taiwan, vol. 25(4), pages 15-41, December.

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    More about this item

    Keywords

    Market efficiency; G-20; financial crises; pre-crisis; during crisis; Samuelson dictum; heteroskedastic; homoscedastic; G11; G14; G15; F36;
    All these keywords.

    JEL classification:

    • G11 - Financial Economics - - General Financial Markets - - - Portfolio Choice; Investment Decisions
    • G14 - Financial Economics - - General Financial Markets - - - Information and Market Efficiency; Event Studies; Insider Trading
    • G15 - Financial Economics - - General Financial Markets - - - International Financial Markets
    • F36 - International Economics - - International Finance - - - Financial Aspects of Economic Integration

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