Linear beta pricing with inefficient benchmarks in a given factor structure

George Diacogiannis and Christos Ioannidis

The European Journal of Finance, 2019, vol. 25, issue 16, 1551-1571

Abstract: We show the equivalence between the zero-beta version of a multi-factor arbitrage pricing model and a linear pricing model utilizing undiversified inefficient benchmarks in a given factor structure. The resulting linear model is a two-beta model, with one beta related to the inefficient benchmark and another adjusting for its inefficiency. This linear model shows that there are only two distinctive and computable sources of risk, affecting security expected returns, despite the existence of several risk factors. In a short empirical example we demonstrate that the model can be employed to provide guidance and allow researchers to test for the validity of their selection of the underlying risk factors driving variations in security returns.

Date: 2019
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DOI: 10.1080/1351847X.2019.1639207

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