پژوهشنامه اقتصاد و کسب و کار
پیاپی 19 (تابستان 1397)

The main objective of this research is to measure the complexity of the value-added tax system in the tax affairs organization of Tehran during the first half of 2013. To collect theoretical foundations of this study, a library method was used and a researcher-made questionnaire was used for collecting statistical data. The Cronbach's alpha coefficient was used for validity and reliability of the questionnaire. For data analysis, Levin tests, mean test of two groups, Friedman test, and spss21 software were used. The results of statistical data analysis at the 95% confidence level show that the effect of factors affecting the complexity of value-added tax in the domain of legal and real persons is significantly different.

Intellectual capital is considered by many scholars as an important resource in organizations, as well as for the impact that can have on corporate performance.  In this research, the relationship between methods of measuring intellectual capital and investment efficiency has been investigated. The research, in terms of target type is a part of applied research and the method of research, in terms of substance and content, is a correlation research. The research framework is deductive-inductive reasoning. Research hypotheses have been analyzed based on information gathered from 141 companies accepted in the Tehran Stock Exchange during the period from 2009 to 2015. The results of the hypotheses test showed that there is no significant relationship between intellectual capital calculated using conventional value method and investment efficiency and the existence of a significant and positive relationship between the intellectual capital calculated by the coefficient of intellectual-Pulic value added and the calculated intellectual capital calculated using the intangible value coefficient with more investment and there is a significant and negative relationship between the intellectual capital calculated by the coefficient of intellectual-Pulic value and intellectual capital calculated using the intangible value coefficient with low capitalization

By the challenge growing in auditing, audit institutions realized the importance of giving their services with the best quality. The performance of auditors working in auditing groups can also affect the quality of the auditing and reduce the effectiveness of the collection of auditing evidence. As auditing managers’ judgment is based on the information and evidences auditors have gathered, their judgment is not different from what the employees have generated. So auditor’s performance influences the quality of auditing. Behaviors reducing quality of auditing made by what auditors have gained within the auditing period makes the documents less effective. These behaviors could have an abominable effect on quality of auditing and also prejudice reliability of this business. The aim of this research is to discover the common behaviors reducing quality of auditing among superior auditors and its relation with their job satisfaction and their commitments to the audit institution. Information needed for this research has been collected by questionnaires. 150 questionnaires have been sent to private audit institutions all over Iran. The accuracy of assumptions of this research have been examined by regression’s statistical analysis. Consequences of this research indicated that behaviors making the quality of auditing less effective have a meaningful relation with auditor’s job satisfaction and also these reducing behaviors have an indirect relevance with organizational commitments.

The purpose of research is to study the effect of beta risk control on the relationship between company value and components of profits in companies admitted to the Tehran Stock Exchange. To this end, the effect of beta risk control on the explanatory power of the relationship between profit and return has been investigated. To test the effect of risk control on the power of regressions, the observations are sorted according to various risk criteria. To this purpose, 128 companies from among the companies admitted in the Tehran Stock Exchange between 2011 and 2016 were selected as samples. Regarding the target type, this is applied research and in terms of content and nature, the research method is a correlation. In this research, a multiple regression model was used to estimate the results. The research findings showed a significant difference in the explanatory power of the profit-return regression equation before and after beta control because the increase in the coefficient of determination is 4%, which is significant.

The main objective of this research is to investigate the effect of information asymmetry, concentration of ownership and dividends on floating stock turnover in the Tehran Stock Exchange. In other words, this paper attempts to answer the question of whether the floating stock turnover is influenced by the increase and decrease of these three variables. To answer this question, a sample of each of the 143 listed companies in the Tehran Stock Exchange was reviewed during the period from 2011 to 2017. In the present study, the Venkatesh and Chiang model designed to measure the price range of stock buying and selling has been used to measure the information asymmetry among investors. For floating stock turnover, the model used by Rahmani et al. (2010) has also been employed. According to Claessens & Associates in 2002, the largest shareholder is accepted as the focus of ownership. Research hypotheses were investigated through multiple regression models. Research findings show that with the increase of information asymmetry and dividends, the turnover of floating shares also increases, but the concentration of ownership does not affect this dependent variable.

The main purpose of the present study is to examine the relationship between corporate investment and stock liquidity with an emphasis on the role of financial constraints of Iran's capital market in the companies accepted at Tehran Stock Exchange from 2013 to 2017. The theoretical foundations of the present study were collected using the library research method through the books, theses papers, and the statistical information was collected using financial statements and relevant notes. The present study employed panel method as the analysis method, and it used EVIEWS7 for analysis. The results of the study suggest that there is a significant relationship between corporate investment and stock liquidity. In addition, the financial constraints have an inverse and significant effect on the relationship between corporate investment and stock liquidity

The constraints of financial resources lead to the loss of investment opportunities for companies operating in competitive industries. The level of this financial constraint affects dividend policies. If the company faces a financial constraint, the decision to increase dividends will exacerbate financial constraints. The purpose of this study is to investigate the effect of financing limitation on the market response following an increase in company dividend. The research carried out in terms of target type is a part of applied research and the research method is correlated in terms of nature and content. The research has been done within the framework of deductive-inductive reasoning and a panel analysis has been used to analyze the hypotheses. Research data was collected from 180 companies between the years 2007- 2015. The results showed that firms with limited funding involve in a weaker market reaction to a profit increase of dividends than unconstrained companies. Additionally, for larger firms and higher book value, market response was greater. The existence of a limitation in financing when dividing dividends into shareholders would weaken the firm's operating status. And ultimately leads to a reduction in stock returns, losing the attractiveness of its stock to shareholders.