Portfolio Diversification and Markowitz Theory

Finance & Accounting
Pages 6 (1506 words)
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Portfolio diversification and Markowitz theory I. Modern portfolio theory Sumnicht (2009, p. 16) asserted that modern portfolio theory continues to “valid after 5 decades” since the theory was articulated. On the other hand, contradicting Sumnicht, Swisher (2009) asserted that modern portfolio theory was never alive in the first place.


However, there is a claim from Swisher & Kasten (2005) that a post-modern portfolio theory factoring in the role emotions and subjectivities has emerged but the leading journals do not confirm the claim. Gitman & Joehnk (1996, p. 670) attribute to Harry Markowitz, a trained mathematician, the development of the first set of theories “that form the basis of modern portfolio.” Modern portfolio theory is “an approach to portfolio management that uses statistical measures to develop a portfolio plan” (Gitman & Joehnk 1996, p. 670). Other than Markovitz, “several other scholars and investment experts have contributed to the theory in the intervening years” (Gitman & Joehnk 1996, p. 670). Gitman & Joehnk (1996, p. 671) identified that some of the key concepts used by the theory “are expected returns and standard deviations of returns for both securities and portfolios and the correlations between returns.” Gitman & Joehnk (1996, p. 673) pointed out that at the theoretical level, the optimal portfolio choice is made by an investor at the point of tangency between the investor’s indifference curve and his or her efficient frontier of investment. ...
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