Some problems with the Markowitz mean-variance model
Markowitz model? The proportionate values of the securities in the investment portfolio vary from one day to the next as prices change and dividends are rein-vested. Table1just shows the proportions on three different Fridays. We refer to this multiple proportion dilemma as the “portfolio problem.” What is a portfolio anyhow?
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www.math.hkust.edu.hkfolio model. Investment theory prior to Markowitz considered the maximization of µP but without σP. 2. The measure of risk by variance would place equal weight on the upside deviations and downside deviations. 3. In the mean-variance model, it is assumed that µi,σi and σij are all known. 4