Results and Conclusions
Based on the research findings ,the lack of a strong relationship between financial ratios and earnings quality and stock returns can be found in the fact that Iranian investors involve in their decisions other factors in addition to these factors, including economic factors (such as exchange rates, inflation and employment rates) as well as political, social and cultural factors. Many factors influencing the investment decision and require a lot of qualitative and quantitative variables evaluations. The same research has drawn a lot of variables, but still understanding the behavior of stock returns and investment decision model is ambiguous.