The capital asset pricing model implies that the market portfolio is efficient and expected returns are linearly related to betas. Many do not view these implications as separate, since either implies the other, but the authors demonstrate that either can hold nearly perfectly while the other fails grossly. If the index portfolio is inefficient, then the coefficient and R[squared] from an ordinary least squares regression of expected returns on betas can equal essentially any values and bear no relation to the index portfolio's mean-variance location. That location does determine the outcome of a mean-beta regression fitted by generalized least squares. Copyright 1995 by American Finance Association.
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Article provided by American Finance Association in its journal Journal of Finance.
Volume (Year): 50 (1995) Issue (Month): 1 (March) Pages: 157-84 Download reference. The following formats are available: HTML
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References listed on IDEAS Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.:
Ravi Jagannathan & Zhenyu Wang, 1993.
"The CAPM is alive and well,"
Staff Report
165, Federal Reserve Bank of Minneapolis.
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