Explaining the Model of Mental Accounting for the Selection of Portfolios of Shares of Companies in the Tehran Stock Exchange with Investment Horizon Approach

The purpose of this research is Explaining the model of the mental accounting framework with the investment horizon approach to optimal portfolio selection. The period of research is 12 years between 2005 and 2016. In this period, 74 companies were selected as sample size through systematic sampling and were investigated. In this research, based on the value or growth of stock, two Markowitz’s and Sortino portfolios were split into forms (A) and (B) to determine if there is a significant difference between the performances of two portfolios. Also, based on the behavioral and mental characteristics of investors, the horizons of investment differ in the choice of investment portfolios. The results of the research confirmed in the first hypothesis that there is a significant difference between the performance of two portfolios (A) and (B) in terms of value characteristics or stock growth. Also, the result of the second hypothesis of the research showed that when investors have longer-term incentives based on mental accounting, portfolios (B), are a more favorable choice, while looking for short-term incentives based on accounting Mentally, they focus on shorter horizons, the portfolio (A) is more desirable.