Efficient market hypothesis in European stock markets

This paper reports the results of tests on the weak-form market efficiency applied to stock market indexes of UK, France, Germany, Spain, Greece and Portugal, from January 1993 to December 2007. We use a runs test, and joint variance ratio tests, which are performed using daily and weekly data for the period 1993–2007 and for a subset, 2003–2007. Daily and weekly returns are not normally distributed, because they are negatively skewed and leptokurtic, and also display conditional heteroscedasticity. Overall, we find mixed evidence on the efficient market hypothesis (EMH). The hypothesis is rejected on daily data for Portugal and Greece, due to first-order positive autocorrelation in the returns. However, the empirical tests show that these two countries have been approaching a martingale behavior after 2003. France and UK data rejects EMH, due to the presence of mean reversion in weekly data, and stronger in recent years. Taken together, the tests for Germany and Spain do not allow the rejection of EMH, this last market being the most efficient.

[1]  F. P. Wheeler,et al.  The efficiency of the Warsaw Stock Exchange : the first few years 1991-1996 , 2002, Economics and Business Review.

[2]  J. Urrutia,et al.  TESTS OF RANDOM WALK AND MARKET EFFICIENCY FOR LATIN AMERICAN EMERGING EQUITY MARKETS , 1995 .

[3]  Hyun-Jung Ryoo,et al.  Variance ratio tests of the random walk hypothesis for European emerging stock markets , 2003 .

[4]  Andrew C. Worthington,et al.  Random walks and market efficiency in European equity markets , 2004 .

[5]  A. Lo,et al.  Stock Market Prices Do Not Follow Random Walks: Evidence from a Simple Specification Test , 1987 .

[6]  E. Fama,et al.  Permanent and Temporary Components of Stock Prices , 1988, Journal of Political Economy.

[7]  Jae H. Kim.  Wild bootstrapping variance ratio tests , 2006 .

[8]  David K. Ding,et al.  A New Variance Ratio Test of Random Walk in Emerging Markets: A Revisit , 2007 .

[9]  Jia He,et al.  A Variance‐Ratio Test of Random Walks in Foreign Exchange Rates , 1991 .

[10]  Martingales in European emerging stock markets: Size, liquidity and market quality , 2009 .

[11]  Bruce Wydick,et al.  How Efficient are Africa's Emerging Stock Markets? , 2002 .

[12]  K. V. Chow,et al.  A simple multiple variance ratio test , 1993 .

[13]  E. Panas.  The behaviour of Athens stock prices , 1990 .

[14]  M. Reyes,et al.  RANDOM WALK TESTS FOR LATIN AMERICAN EQUITY INDEXES AND INDIVIDUAL FIRMS , 1999 .

[15]  A. Abraham,et al.  Testing the Random Walk Behavior and Efficiency of the Gulf Stock Markets , 2002 .

[16]  B. Huang,et al.  Do Asian stock market prices follow random walks? Evidence from the variance ratio test , 1995 .

[17]  M. Ariff,et al.  The Effects of de-regulation on share-market efficiency in the Asia-Pacific , 1998 .

[18]  Efficiency Tests in the Iberian Stock Markets , 2002 .

[19]  J. Stock,et al.  Drawing Inferences from Statistics Based on Multi-Year Asset Returns , 1989 .

[20]  E. Fama.  EFFICIENT CAPITAL MARKETS: A REVIEW OF THEORY AND EMPIRICAL WORK* , 1970 .

[21]  Olivier Darné,et al.  Variance-Ratio Tests of Random Walk: An Overview , 2009 .

[22]  James G. MacKinnon,et al.  Approximate Asymptotic Distribution Functions for Unit-Root and Cointegration Tests , 1994 .

[23]  Jae H. Kim,et al.  Are Asian stock markets efficient? Evidence from new multiple variance ratio tests ☆ , 2008 .

[24]  Hyun-Jung Ryoo,et al.  African stock markets: multiple variance ratio tests of random walks , 2002 .

[25]  Jonathan H. Wright.  Alternative Variance-Ratio Tests Using Ranks and Signs , 2000 .

[26]  Emmanuel Flachaire,et al.  The wild bootstrap, tamed at last , 2001 .

[27]  J. Belaire-Franch,et al.  A Variance Ratio Test of the Behaviour of Some FTSE Equity Indices Using Ranks and Signs , 2005 .