This book evaluates the relationship between the forward-backward effects depending on the risk and ‎ratio of book value to the stock market value on the stock return and fluctuation of active companies listed in the Tehran Stock Exchange. The portfolio formation method has been used in order to reduce the correlation among these variables. The survey indicated that all independent variables did not have a significant impact on the dependent variable. The book shown that in down market, return on high trading ratio of book value to the stock market value portfolio lead return on low trading ratio of book value to the stock market value portfolio by controlling risk level (b).The next part of study show that this study indicated volatility exposure from low trading the ratio of book value to the stock market value (small risk (b)) portfolio to high trading the ratio of book value to the stock market value (big risk (b)) portfolio returns. In other words, the return of portfolio gives simultaneous reaction to the news published in the market. The text is designed to cover Investment Management and Stock Exchange Market theory, concepts, evidence, policy and practice.