Study Can Explain the Systematic Risk-Based Downside Capital Asset Pricing Model (D-CAPM) with CAPM Model in Company Accepted in Tehran Stock Exchange

Capital Asset Pricing Model (CAPM) is the most basic models in the evaluation of financial assets are considered to justify investors. Despite this high performance model for investment decisions over time criticisms of this model has been entered. This research to study Downside Capital Asset Pricing Model (D-CAPM) to determine if the addresses in the Tehran stock exchange relationship between risk and return, according to this model is how. Research, descriptive research component is compared. The 81 sets in Tehran stock exchange have been studied. data through new software Rah avard been collected through software SPSS, Excel has been processed. Original research question is: How can the D-CAPM model deployment process to assess systemic risk in the company accepted payment in Tehran Stock Exchange? The results show that, Capital Asset Pricing Model explains a reduction in risk and return is highly efficient and similar risks, expected returns and yields more similar, less risk to the investor income