A five-factor model directed at capturing the size,value, profitability, and investment patterns in average stock returns is rejected on the GRStest, but for applied purposes it provides an acceptable description of average returns. The model’s main problemis its failure to explain the low average returns on small stocks that invest a lot despite low profitability. The performance of the model is not sensitive to the specifics of the way its factors are defined, at least for the definitions considered here.
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