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Accounting PhD student and a visiting lecturer of Payam Noor University
Abstract
In this research we tried to test the inverse correlation between the number of shares constituting the portfolio and risk, Optimal portfolio diversification to minimize risk for short-term and long-term investors willing to set the Tehran Stock Exchange .For this purpose, historical stock data collected over a period of six years from 1384 to 1389 under various portfolios using a simulation software MATLAB have hurt .In this study, we find that for population research and samples, which included 40 a share, for Short term investments to maximize diversification that will (38 shares) and Long-Term Investments is better than 34 we share in your portfolio to achieve the desired utility.