Approximating the growth optimal portfolio with a diversified world stock index
Purpose ? This paper aims to construct and compare various total-return world stock indices based on daily data. Design/methodology/approach ? Because of diversification, these indices are noticeably similar. A diversification theorem identifies any diversified portfolio as a proxy for the growth optimal portfolio. Findings ? The paper constructs a diversified world stock index that outperforms a number of other indices and argues that it is a good proxy for the growth optimal portfolio. Originality/value ? The diversified world stock index has applications to derivative pricing and investment management.
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