This research aimed to test the concept Market efficiency in the medium, using the event as a test tool to study the efficiency of the stock exchange, Thai. During the years 2010-2012 from study results In the case of a dividend Investors receive regular yields exceed accumulated thawachalia Statistical significant at 0.5 in every study that is found more normally yields cumulative average. During the first day and the day after the announcement, published from this study shows that investors receive compensation that exceeds the normal roll in every moment. Although investors will receive a return beyond the normal range of dividend, which indicates that the stock exchange of Thailand Thai. Rapid public information response, but yield more than usual, it still occurs continuously. The stock exchange of Thailand Thai is not effective in medium.
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