درخت حوزه‌های تخصصی

In the world and in our country, Iran, many researches have been done in the field of financing, but due to the importance of this issue, it needs more thought and contemplation. Therefore, this study assessed “the impact of investments on financing of companies listed on the Tehran Stock Exchange”. The statistical sample is consisted of companies listed on the Tehran Stock Exchange during a five-year period (2010-2014). Ultimately, regarding the limitation of the study and using systematic elimination method, data of 155 companies has been collected. This study in terms of the purpose is a practical research. In terms of type of research design because of relying on historical data, is post-event and its inference method is inductive and in correlation type. This study includes four major hypotheses. In this study to assess the hypotheses, the linear regression has been used. To analyse the data and test hypotheses, EVIEWS software is used. After design and test the study hypotheses that have been done by the separation of each hypothesis, we founded that the current and long-term investments have impact on financing methods through the sale of stocks and debt.

Efficient financial markets with high degree of transparency do not substantiate the hypothesis that there are differences in the volatility of return. Generally, there are factors rejecting any perfect similarity in the volatility of return in the emerging stock markets, as previous studies in Iran have confirmed the complete difference. On the other hand, the hybrid model PANEL-GARCH has the benefit of high process accuracy, suggesting that the evaluation of the similarity in the volatility of return at the level of market or industry constituent units is better than the simple technique of time series GARCH model for the entire market (instead of evaluation at unit levels). Therefore, the present study intends to investigate complete similarities or differences in the volatility of return in Iran's industries. Results showed that the assumption of complete difference in the volatility of return in the industries did not hold. The results of this process for Iran's industries covering the timespan between 16/2/2013 to 18/3/2017 showed that there are similarities in terms of the y-intercept of conditional mean and variance equations (1.1) PANEL-GARCH between the volatility of stock returns of 23 industries in the Tehran Stock Exchange as confirmed by LRT test. 

Return on investment is a driving force that motivates and is a reward for investors. Investment returns are important for investors, in order for the entire investment game to be realized. Evaluating efficiency is the only logical way (Before risk assessment) that investors can do to compare alternative and different investments. Measuring real returns (relative to the past) is needed to better understand investment performance. Particularly, the study of past returns has a major role in predicting and predicting future returns. Therefore, the present study seeks to "investigate the effect of the internal rate of return on cash recycling on unusual returns as well as the effect of cost leadership strategies variables on the relationship between the internal rate of return on cash recycle and the unusual returns in the period from 2009 to 2013. In this research, the sample consists of 72 companies that have been selected by systematic elimination method, which is a total of 360 years. In this research, linear regression and correlation coefficient were used to investigate the hypotheses of the research. EVIEWS software has been used to analyse the data and test the research hypotheses. According to the regression results, the following results were obtained: 1. An internal rate of return on cash recycling affects unusual returns. 2. The internal rate of return based on the recycling of cash The abnormal returns affect the strategy of cost leadership.

The phenomenon of the financial crisis is not a new phenomenon around the world. The structure of an economy or a set of economies may face a financial crisis. In fact, it is deformation, dimensions, causes and roots of the financial crisis which create a state of change from this crisis. Recently, evidence has shown that the market value of firms subject to bankruptcy is significantly reduced. In this study, the impact of the financial crisis on conservative accounting and transparency of banks in Iran has been studied. After designing the transparency indicators, the transaction information was collected from the Stock Exchange in the five-year period of 2011-2015. The statistical sample consists of 18 banks selected by systematic elimination method, which in total were 90 years-bank. In this research, linear regression and correlation were used to investigate the hypotheses of the research. Eviews software was used to analyze the data and test the hypotheses. What can be said in the overall conclusion of testing the hypotheses is that the financial crisis affects the conservative accounting and transparency of banks.

How the investors react to the received information plays a crucial role in determining the return of stock exchange market. Supply and demand based upon incorrect decisions lead to the price deviation of inherent values. This paper aims to study the impact of salience phenomenon on disproportionate pricing and investor overreaction in the corporates in Tehran stock exchange. Research methodology is correlative. Statistical sample involves 120 corporates accepted by Tehran stock exchange during 2012-2016. To test the hypotheses, a regression analysis method has been selected. Research findings have indicated that there exists a promising phenomenon in Tehran stock exchange causing the investors overreaction followed by the disproportionate pricing and also, the results have shown that the impact of salience is different on strong and weak information environments.