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According to the Capital Pricing Model (CAPM), market return is related to risk associated with macroeconomic health of the economy, which in turn affects systematic risk component. This study was aimed at investigating and risk of market return fluctuations as well as the relationship between macroeconomic variables, such as inflation rate, exchange rate, private investment in real estate and total stock market return risk. Monthly data during 2001 to 2009 and GARCH-M model have been used in this study. Results show that inflation rate and housing return rate have negative effects on systematic risk but, risk premium and exchange rate coefficient are not significant

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One of the important issues that have been the focus of economists in developed and developing countries for the last several decades is the study of the effect of External Shocks on  macroeconomic variables of those countries.In this paper In order to investigate the effect of external shocks including world oil price, exchange rate and global inflation shocks on macroeconomic variables of Iran, We solved a stochastic dynamic general equilibrium (DSGE) model with the new Keynesian approach. The present study uses seasonal time series data from 1989 to 2016 to calculate the steady-state values of some variables in equilibrium state and to quantify other parameters from previous studies. Our main finding shows that GDP and non-oil production increase after a positive oil price shock. Our main finding shows that GDP and non-oil production increase after a positive oil price shock. In the case of oil production, at least in the short run, oil production can be somewhat low elasticity to price fluctuations. Also, exchange rate shock has a significant impact on domestic macroeconomic variables. As for the global inflation shock, we can say that, it has a weak influence on domestic variables.