Stock-market efficiency in emerging markets: Evidience from Vietnamese stock market

Abstract

The objective of this study is to find out whether the Vietnamese stock market is weak-form efficient. This paper applies data daily and weekly returns of VN-index and HNX-index in Hochiminh and Hanoi Stock Exchange, respectively from 2000 to 2013. The results obtained from the test indicate significant deviations from the random walk hypothesis of the stock returns in the Vietnamese market, in which the majority of data experience is positive correlations. Furthermore, the nonparametric runs test is used to determine the randomness of a price or a return sequence as an alternative. The test once again confirms that the Vietnamese stock market is not weak-form efficient.