Identification and role of environmental factors affecting the movement of the three levels of stock prices using fuzzy technique

The intervention of the government and the presence of political figures and parallel to that monetary policy is a set of decisions and measures used by the monetary and government authorities to influence economic activities and increase stock price levels by trying to maintain balance and not create price bubbles. The purpose of this research is to identify the environmental factors caused by political communication and monetary policy using the fuzzy technique and its role in the movement process of the three levels of stock prices. The research sample includes 143 companies from the companies accepted in the Tehran Stock Exchange, which covers a seven-year period from the beginning of 2014 to the end of 2021. The results show that there is a positive and significant relationship between the factors identified as environmental factors and the three levels of stock prices. Achieving this result strengthens the argument that if political connections are important in determining the price of companies' shares and, in parallel, the value of companies; should be systematically reflected in the stock market. Also, the results show that the effect of monetary policy on the high level of stock prices is more than the low level of stock prices and does not affect the average levels of stock prices. The results indicate that if the government implements an expansionary monetary policy, there is more available credit and economic activity will flourish.