Abstract
Routinely, practictioners and academics alike propose the use of trading strategies with an alleged improvement on the risk-return relation, tipically entailing a considerably higher return for the given level of risk. very popular example is A quantitative approach to tactical asset allocation'' by the fund manager M. Faber, a real hit in the SSRN online library. Is this paper a counterexample to market efficiency? We reject this conclusion, showing that a lot of caution should be used in this field, and we indicate a series of bootstrapping experiments which can be easily implemented to evaluate the performance of trading strategies.
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