عنوان مقاله [English]
Capital is one of the fundamental factors in assessing the health and stability of the banking system. On the other hands, the value of the banks’ capital has a significant effect on their competitive position. Therefore, the utility and appropriateness of the capital base is as safe cover against a wide range of banking risks. The purpose of this study was to determine the effect of Buffer capital changes on the risk changes of banks’ portfolios. This research has been collected in term of applied methodology and accomplished transaction data in the period of five years from 2011 to 2015. The statistical population of the study consisted of 17 with systematic elimination sampling from Stock Exchange organization. For analyzing the data, Linear Regression and Correlation tests were used Eviewse software. The research results show, changes in Buffer capital have a significant effect on portfolio risk changes and given the negative coefficient of the variable of the Buffer capital changes, there is an inverse relationship between Buffer capital changes and portfolio risk changes. Also, Buffer capital changes in interaction with the business cycle, income diversification and asset fluctuation affects banks’ portfolio risk changes.