Towards the Design of Better Equity Benchmarks

Following recent research on the relevance of idiosyncratic risk in asset pricing models, Lionel Martellini proposes to use total volatility as a model-free estimate of a stock's excess expected return, and analyze the implications in terms of the design of improved equity benchmarks.

Author(s) :

Lionel Martellini

Professor of Finance and Scientific Director of the EDHEC Risk and Asset Management Research Centre

Presentation :

The author finds that maximum Sharpe ratio portfolios consistent with such expected return proxies, and built upon improved estimates of the correlation parameters, significantly outperform market cap weighted schemes on a risk-adjusted basis. This analysis, which rehabilitates the role of the tangency portfolio from modern portfolio theory, suggests that better equity benchmarks can be designed, provided that a sophisticated portfolio optimization procedure is used that relies on robust estimates of moments and co-moments of stock return distributions. This paper has important potential implications for the ongoing debate on appropriate weighting schemes for equity indices.
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Towards the Design of Better Equity Benchmarks...
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Type : Working paper
Date : le 13/10/2008
Extra information : Pour plus d'informations, nous vous prions de vous adresser à Séverine Anjubault, Direction de la recherche de l'EDHEC [ severine.anjubault@edhec.edu ] Les opinions exprimées sont celles des auteurs et n'engagent pas la responsabilité de l'EDHEC.
Research Cluster : Finance

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