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Decreasing absolute risk aversion: some clarification

Author

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  • Moez Abouda

    (CES - Centre d'économie de la Sorbonne - UP1 - Université Paris 1 Panthéon-Sorbonne - CNRS - Centre National de la Recherche Scientifique, BESTMOD - ISG - Institut Supérieur de Gestion de Tunis [Tunis] - Université de Tunis)

Abstract

La Vallée (1968), in the expected utility model, gives a sufficient condition for positivity of the bid-selling spread. In this article, we show that this sufficient condition, namely decreasing absolute risk aversion (DARA) is in fact necessary. Moreover, we prove that the expected utility hypothesis and differentiability of the utility function are not required.

Suggested Citation

  • Moez Abouda, 2008. "Decreasing absolute risk aversion: some clarification," Université Paris1 Panthéon-Sorbonne (Post-Print and Working Papers) halshs-00270648, HAL.
    • Handle: RePEc:hal:cesptp:halshs-00270648
    Note: View the original document on HAL open archive server: https://shs.hal.science/halshs-00270648
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    Cited by:

    1. Chateauneuf, Alain & Ventura, Caroline, 2010. "The no-trade interval of Dow and Werlang: Some clarifications," Mathematical Social Sciences, Elsevier, vol. 59(1), pages 1-14, January.

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