Quarterly Studies in Banking Management and Islamic Banking

Abstract Overconfidence is one of the most common cognitive biases among managers and investors. Overconfident managers usually underestimate the risk of investments because of the illusion of control and make additional investments to continue expanding their business empire. In this study, the relationship between managerial overconfidence, internal financing, and investment efficiency is examined. This research is a type of post-event research and is based on the analysis of the observed data. The statistical sample included 148 companies listed on the Tehran Stock Exchange (TSE) and Iran Fara Bourse Securities Exchange (IFB) over 10 years (2008-2017). Data regression analysis, Panel data analysis, are used to determine the relationships. The results show that there is no positive and significant relationship between managerial overconfidence and internal financing. There is also a significant relationship between internal financing and investment efficiency, we concluded that managerial overconfidence has not got a significant effect on the relationship between internal financing and investment efficiency.

Abstract The main purpose of this study is the relationship between prudential regulation of capital and banks' risk-taking with the moderating role of investment efficiency. The statistical population is all banks and financial institutions listed on the Tehran Stock Exchange. The research period includes the years 1391 to 1397. To achieve this goal, data from 20 banks were used. In this study, it has been shown that with investment efficiency, prudential regulations increase banks' capital and reduce their risk-taking. Prudential regulations also increase the prudential behavior of banks by reducing risk and increasing the capital of banks, which indicates that most of the country's banks in recent years have moved in line with regulatory frameworks and international regulations.