Why is the risk of a portfolio of shares normally lower than the average risk of the shares of the portfolio?
On a general level, investment managers and academic economists have long been aware of the necessity of taking returns as well as risk into account: "all your eggs should not be placed in the same basket". This is where the idea of holding a portfolio of shares comes from. Modern portfolio theory (MPT), or portfolio theory, was introduced by Harry Markowitz with his paper "Portfolio Selection" which appeared in the 1952 Journal of Finance. Thirty-eight years later, he shared a Nobel Prize with Merton Miller and William Sharpe for what has become a broad theory for portfolio selection. Por…
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- Why is the risk of a portfolio of shares normally lower than the average risk of the shares of the portfolio?
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