Iranian Journal of Finance

The dynamics of corporate information environments are seen as a basis for managerial decision-making such as sustainable tax development, which can reduce agency costs and promote market-level information symmetry across regulatory bodies. The purpose of this research is presenting a Model of Sustainable Tax Development Functions under the Information Environment of Tehran Stock Exchange Companies. In this research-based on qualitative and quantitative methodology, Initially, 13 tax professionals who were also active at the university level, Participated in the Meta-synthesis and the Delphi section to validate the research components and indicators among the 11 approved studies, Delphi analysis used to identify the theoretical adequacy of the component and the set of indices. In the quantitative section, 28 CEO of the stock exchange companies who were selected through an available sampling method selected randomly and used matrix questionnaires to stratify the identified indices in a range of the most influential indices. To the least effective indicators. The results in qualitative Analysis indicate the existence of three main components in the form of the final indicators based on theoretical adequacy and in the quantitative section, it was found that the indicators, greater dynamics of the value of the company based on tax transparency (C1) as an indicator of external information environment functions and increased The level of disclosure of economic performance in line with the GRI standard (C9) and the strategic balance between tax minimization and corporate value (C10) as an indicator of the component of internal information environment functions most strongly as a consequence of sustainable tax development under corporate information environment conditions for stock companies. Tehran Stock Exchange. These results show that the development of sustainable tax functions under corporate information environment conditions can also help to improve the effectiveness of corporate internal operations, regardless of the positive effects on the competitive and market levels.

The objective of the current survey was to excavate the effect of the rate of hormones in the blood, age, and gender on the financial behavior of managers. Also, preparing and propounding the neurofinance model of financial behaviors that have generated anomalies such as optimism in the market is other intentions of this study. This research has been operated with an inductive approach and experimentally in a one-time period in a statistical population consisting of 37 male and female managers with an average age of 25-60 years. The amounts of the testosterone, free testosterone, cortisol T3, T4, and TSH were deliberate in a medical diagnostic laboratory with a blood test. Managers' optimism data were accumulated with a standardized questionnaire straight away afterward receiving the blood sample. The prepared data were analyzed with SPSS and LISREL and RSM software. The outcomes demonstrated that age has a significant inverse relationship with optimism. Free Testosterone; T4 and testosterone play an inverse role in optimism augmenting. Cortisol and T3 are straightly related to optimism. Also, financial behavior is further related to the dimension of optimism in women than men, and with growing older, optimism decreases. The significant effect of testosterone and cortisol, age and gender on optimism, confirmed the effect of these hormones on the financial behavior in other studies. The effect of testosterone and thyroid hormones on optimism was considered in this survey for the first time.

The relationship between risk and return is not symmetric under different circumstances. As the prospect theory describes, the value function which passes through the reference point is steeper for losses than gains (asymmetric risk appetite). But such an asymmetrical risk aversion could be traced in different periods of investment and market boom and bust cycles behind the reference point. Moreover, investors’ asymmetric behavior is different regarding various risks, such as market risk, illiquidity risk, and credit risk. This paper examines the asymmetric investors' reaction to various risks in Tehran Stock Exchange (TSE) both in recession and growth from 2011 through 2016. Evidence reveals that although all three kinds of risks are relevant, especially illiquidity risk, risk factors’ explanation power in the bullish market is less than the bearish one. This indicates that investors tend to show an asymmetric reaction to risk in up and downswing markets. The asymmetric behavior is also predominant due to investors’ weak attention to the market risk in a growing market in opposition to a recessive market condition that turns out to be an important risk consideration. The results of this study can help investors to consider asymmetrical behavior effect when they are making their minds on investment decisions.

New technology ventures currently play a key role in the economic performance of countries. Financing methods are among strategic issues facing entrepreneurs for launching a business, which must be reviewed by researchers and policymakers of finance and investment; thereby new technology ventures are of importance in the economic growth trend and sustainable development. This study is aimed at reviewing the effects of internal and external factors on the selection of financing strategies by new technology ventures. Statistical society of the present research includes start-up companies. Data collection method includes library research and field research. Descriptive-practical research method and data analysis tools, Delphi techniques and experts' panel, and regression analysis. Firstly, upon designing the preliminary questionnaire and distribution thereof among academic experts and new technology ventures, totaling 29, main and secondary elements were extracted based on the information received from the experts. Then, at the next stage, for the explanation of the designed model, the final questionnaire of research, incl. general and specialized questions are prepared and drawn up, and upon distribution of the final questionnaire among the statistical sample, comprising start-up companies, the stated questionnaire was distributed among 384 companies. Research results indicate a positive and significant effect of internal variables of companies concerning the role of intermediary variables on traditional and new financing methods. Notably, external variables of companies have a significant effect on traditional and new financing methods through intermediary variables. These results indicate the importance of internal and external factors of companies on the determination of financing strategy of start-up companies in Iran.

Corporate investment decisions are determined by a variety of factors, including various managerial measures, including overconfidence of managers, which are important determinants of corporate investment decisions. Most corporate executives prefer internal financing, but if internal resources are not sufficient to meet this need, they use external resources with the least degree of information asymmetry. The purpose of this study was to investigate the effect of managerial overconfidence on investment and the moderating effect of the internal financing method is on their relationship. The study consisted of listed companies in Tehran Stock Exchange during the period 2011 to 2016 and using a systematic elimination sampling method, 97 companies were selected. To investigate the research hypotheses, EVIEWS software and panel data regression method was used. The results of the research showed that managers’ overconfidence has a positive and significant effect on investment as well as underinvestment, but internal financing does not have a significant effect on the relationship between the overconfidence of managers and investment as well over-investment. But the effect of internal financing on the relationship between managers’ overconfidence and underinvestment was a significant positive. Finally, it became clear that internal financing had a significant negative impact on investment and over-investment.

Since the 1970’s developing and developed countries have experienced unprecedented public debt levels. This surge in public debt has emphasized the importance of public debt management. Since risks such as reducing economic growth, increasing inflation, and depreciation of the national currency accompany unplanned public debt accumulation, governments should be alert not to endanger economic growth with ill-considered borrowing. In this paper, we aim to analyze Iran’s external debt variations concerning major macroeconomic variables such as GDP growth as a proxy of economic growth, inflation, and sovereign oil generated incomes. The method that is applied in this research is cross wavelet transform which is a powerful mathematical approach for analyzing the financial data.      Our results show there are different patterns in small and large scales between variables and external debt as a dependent variable has different relations with endogenous and exogenous factors. In the short run, low oil prices as an exogenous variable, during the 1980s have shaped governments’ debt accumulation behavior but on larger scales, indigenous variables such as governments’ budget deficits have been much more dominant in shaping governments borrowing patterns. In a chronological view, US cruel sanctions and the Iran-Iraq war were major events affecting sovereign borrowing behavior.