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Possibility of yielding
Diversifying the portfolio can reduce unsystematic risk. Harry Markowitz pointed out correctly by choosing the stock does not move in the same direction, investors can reduce the standard deviation profit margins like. In financial investments, investors sought to achieve the highest profit margins. Harry gave the model analysis of the factors affecting the market for financial assets and allows solving the problem of the financial investment in a pair of investment products. Models consider the relationship between average income and the optimal risk level as measured by the variance of income so you can call this model the mean-variance model.
Markowitz has introduced the concept of portfolio Effective as follows: portfolio performance is the list with the lowest risk in any one expected profitability rate is determined in advance, or the ratio of the highest expected return at any level of exposure Risk is defined.
The order to find efficient portfolios as follows:
- Assign before an expected return rate on the portfolio
- Solution optimization problem to find out the proportion of each stock Securities in portfolio
- turn change predefined values with the expected return rate on the list, we will find the set of portfolios with the corresponding standard deviation. Curve set of portfolios with the lowest standard deviation on the graph is called a border smallest variance. On the edge of the smallest variance, point A represents the portfolio with the smallest standard deviation compared with a standard deviation of all of the portfolio can be made up of n securities. The upper part of the edge of the smallest variance represents the effective list, called the edge effect. The list is located on the edge of the portfolio effect is to provide the opportunity risk - the best income compared with all possible portfolio of securities composed of n. Investors may choose any category on the edge of this effect, depending on the coefficient of risk aversion of investors there.
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