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Article
Author(s)
Valery V. Shemetov
Full-Text PDF XML 396 Views
DOI:10.17265/2328-2185/2022.05.004
Affiliation(s)
ABSTRACT
Discussing results in asset
pricing and efficient portfolio allocation, we show that mixed success and errors
in these results often follow from a lack of information about the asset return
distribution and wrong assumptions about its properties. Some mistakes in asset
pricing come from the assumption of symmetry in return distributions. Some errors
in efficient portfolio allocation follow from Markowitz’s approach when applying
it to portfolio optimization of skewed asset returns. The Extended Merton model
(EMM), generating skewed return distributions, demonstrates that (i) in skewed asset
returns, the variance is not an adequate measure of risks and (ii) positive skewness
in the asset returns comes together with a high default probability. Thus, the maximization
of the mean portfolio returns and skewness with controlled variance used in mainstream
papers can critically increase portfolio risks. We present the new settings of the
optimal portfolio allocation problem leading to less risky efficient portfolios
than the solutions suggested in all previous papers.
KEYWORDS
asset pricing, efficient portfolio allocation, skewed returns, default probability, Extended Merton model
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