عوامل مؤثر بر شاخص قیمت سهام

The goal of this research is determining the effective factors on stocks price index using Fuzzy approach in Tehran Stock Exchange. Based on the literature, a sample of 150 people has been selected using group sampling among 500 people by application of Fuzzy technique and SPSS software. The targeted model is extracted by gathering data through documentation, interview and questionnaire with 86 percent of reliability. The results show that managerial and political variables have the greatest effects on stocks price index among the four internal variables (structural, financial, marketing and managerial) and three external variables (economic, political and cultural). Also, the effect of internal factors on stock price index was more than external factors.