By Mean Reversion behavior come from Overreaction Hypothesis of securities from the investors information received and Tversky and Kahneman (1973) De Bondt and Thaler (1985) has made a study of the behavior of the stock price of United States during the year. R. 1916-1982 by splitting shares into two groups: Group Winners or stock prices are rising dramatically throughout the 3 years ago and Losers or stock price adjustment group ta dramatically throughout the 3 years ago and compare the yields realized during the whale.Later, after those stocks are grouped. I found that the stocks in the group "winners" have significantly dropped prices. While shares in the group, "lost" is back for a price increase, which results in this study, Mean Reversion behavior support at the same time to reject the assumption of Random Walk also. There is also an assumption about the nature of the market price of the securities must be described by data in the past. Is the Random Walk hypothesis of rejection behavior?
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