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Yes, The APT Is Testable

by PHILIP H. DYBVIG, STEPHEN A. ROSS
The Journal of Finance ()
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Abstract

The Arbitrage Pricing Theory (APT) has been proposed as an alternative to the mean-variance Capital Asset Pricing Model (CAPM). This paper considers the testability of the APT and points out the irrelevance for testing of the approximation error. We refute Shanken's objections, including his assertion that Roll's critique of the CAPM is applicable to the APT. We also explain the testability of the APT on subsets, and we explore the relationship between the APT and the CAPM. [ABSTRACT FROM AUTHOR]

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