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Two Paradigms and Nobel Prizes in Economics: a Contradiction or Coexistence?

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  • Haim Levy
  • Enrico G. De Giorgi
  • Thorsten Hens
Abstract
  Markowitz and Sharpe won the Nobel Prize in Economics for the development of Mean†Variance (M†V) analysis and the Capital Asset Pricing Model (CAPM). Kahneman won the Nobel Prize in Economics for the development of Prospect Theory. In deriving the CAPM, Sharpe, Lintner and Mossin assume expected utility (EU) maximisation in the face of risk aversion. Kahneman and Tversky suggest Prospect Theory (PT) as an alternative paradigm to EU theory. They show that investors distort probabilities, make decisions based on change of wealth, exhibit loss aversion and maximise the expectation of an S†shaped value function, which contains a risk†seeking segment. Can these two apparently contradictory paradigms coexist? We show in this paper that although CPT (and PT) is in conflict to EUT, and violates some of the CAPM's underlying assumptions, the Security Market Line Theorem (SMLT) of the CAPM is intact in the CPT framework. Therefore, the CAPM is intact also in CPT framework.

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  • Haim Levy & Enrico G. De Giorgi & Thorsten Hens, 2012. "Two Paradigms and Nobel Prizes in Economics: a Contradiction or Coexistence?," European Financial Management, European Financial Management Association, vol. 18(2), pages 163-182, March.
    • Handle: RePEc:bla:eufman:v:18:y:2012:i:2:p:163-182
    DOI: 10.1111/j.1468-036X.2011.00617.x
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    3. Amen Aissi Harzallah & Mouna Boujelbene Abbes, 2020. "The Impact of Financial Crises on the Asset Allocation: Classical Theory Versus Behavioral Theory," Journal of Interdisciplinary Economics, , vol. 32(2), pages 218-236, July.
    4. Maxime MERLI & Antoine PARENT, 2022. "Portfolio Diversification During the Belle Époque: When the Actual Portfolios of French Individual Investors Met Behavioral Finance," Working Papers of LaRGE Research Center 2022-01, Laboratoire de Recherche en Gestion et Economie (LaRGE), Université de Strasbourg.
    5. Rabah Amir & Sergei Belkov & Igor V. Evstigneev & Thorsten Hens, 2022. "An evolutionary finance model with short selling and endogenous asset supply," Economic Theory, Springer;Society for the Advancement of Economic Theory (SAET), vol. 73(2), pages 655-677, April.
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    7. Matteo Del Vigna, 2012. "Stochastic dominance for law invariant preferences: The happy story of elliptical distributions," Working Papers - Mathematical Economics 2012-08, Universita' degli Studi di Firenze, Dipartimento di Scienze per l'Economia e l'Impresa.
    8. Nicholas Apergis & James E. Payne, 2018. "Monetary policy rules and the equity risk premium: Evidence from the US experience," Review of Financial Economics, John Wiley & Sons, vol. 36(4), pages 287-299, October.
    9. Haim Levy & Moshe Levy, 2021. "Prospect theory, constant relative risk aversion, and the investment horizon," PLOS ONE, Public Library of Science, vol. 16(4), pages 1-21, April.

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