This research examines the relationship between investors' emotional tendencies, competition in the product market and the company's commercial credit among the companies of the Tehran Stock Exchange. The current research is applied in terms of purpose, quantitative in terms of data type, inductive in terms of implementation logic, and descriptive-correlation in terms of implementation. Various sources such as books, domestic and foreign articles, and the Internet have been used in this research. The relationships between variables have been tested using correlation and multiple regression models with a dynamic panel approach. First, the collected data were classified in Excel software, and after organizing and calculating the variables, R statistical software was used to analyze the data. In order to investigate the hypotheses of the research, a statistical sample of the companies accepted from the Tehran Stock Exchange was considered by the available community method during the years 1390-1399. Based on the statistical analysis and estimation of regressions, the results of the hypothesis test at the expected error level showed that there is a significant relationship between the emotional tendencies of investors and the commercial credit of the company. Product market competition does not moderate the relationship between investors' emotional inclinations and firm's business credibility.