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...

Based on the recent developments in market microstructure and applications of nonlinear dynamics and chaos theory to financial time series, the subsequent article questions the validity of traditional methods used to test the efficient market hypothesis. In particular, it emphasizes the...