Firm Value and the mis-use of the CAPM for valuation and decision making
This paper shows that a decision maker using the CAPM for valuing firms and making decisions may contradict Modigliani and Miller’s Proposition I, if he adopts the widely-accepted disequilibrium NPV. As a consequence, CAPM-minded agents employing this NPV are open to arbitrage losses and miss arbitrage opportunities. As a result, even though the use of the disequilibrium NPV for decision-making is deductively drawn from the CAPM, its use for both valuation and decision should be rejected.
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- Dybvig, Philip H & Ingersoll, Jonathan E, Jr, 1982. "Mean-Variance Theory in Complete Markets," The Journal of Business, University of Chicago Press, vol. 55(2), pages 233-51, April.
- Magni, Carlo Alberto, 2007.
"Project valuation and investment decisions: CAPM versus arbitrage,"
14525, University Library of Munich, Germany.
- Carlo Alberto Magni, 2007. "Project valuation and investment decisions: CAPM versus arbitrage," Applied Financial Economics Letters, Taylor and Francis Journals, vol. 3(2), pages 137-140.
- Rubinstein, Mark E, 1973. "A Mean-Variance Synthesis of Corporate Financial Theory," Journal of Finance, American Finance Association, vol. 28(1), pages 167-81, March.
- Magni, Carlo Alberto, 2002. "Investment decisions in the theory of finance: Some antinomies and inconsistencies," European Journal of Operational Research, Elsevier, vol. 137(1), pages 206-217, February.
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