Abstract
The present study evaluates the effect of investment diversification on the return on investment and risk as long as the central bank's monetary policy factors will affect how banks investment. Methodology: This study has a descriptive-correlation nature that has analyzed the financial information of 10 active banks in Tehran stock exchange in the period of 1388 to 1392 using the SPSS version 21. In this study Hirschman-Herfindahl index (HHI) was used to evaluate the investment diversification level of banks in various economic parts. The normality of research data, the holograph – Esmirnoph test has been used and the Durbin Watson test was used for investigating the independence among errors. Results: The (ANOVA) variance analysis test has been used for investigating the meaningfulness of regression. Results showed that investment diversification has a negative and inverse effect on investment return and risk. Conclusion: Also any of control variable and interfere has no effect on investment return and bank risk.
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