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1/N and Long Run Optimal Portfolios: Results for Mixed Asset Menus

  • Carolina Fugazza
  • Massimo Guidolin
  • Giovanna Nicodano

Recent research [e.g., DeMiguel, Garlappi and Uppal, (2009a), Rev. Fin. Studies] has cast doubts on the out-of-sample performance of optimizing portfolio strategies relative to a naive, equally-weighted ones. However, most of the existing results concern the simple case in which an investor has a one-month horizon and mean-variance preferences. In this paper, we examine whether this finding holds for longer investment horizons, when the asset menu includes bonds and real estate beyond stocks and cash, and when the investor is characterized by constant relative risk aversion preferences which are not locally mean-variance for long horizons. Our experiments indicates that power utility investors with horizons of one year and longer would have on average benefited, ex-post, from an optimizing strategy that exploits simple linear predictability in asset returns over the period January 1995 - December 2007. This result is insensitive to the degree of risk aversion, to the number of predictors being included in the forecasting model, and to the deduction of transaction costs from measured portfolio performance.

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Paper provided by Collegio Carlo Alberto in its series Carlo Alberto Notebooks with number 190.

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Length: 45 pages
Date of creation: 2010
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Handle: RePEc:cca:wpaper:190
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