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Consensus Consumer and Intertemporal Asset Pricing with Heterogeneous Beliefs

  • Jouini, Elyès
  • Napp, Clotilde
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    The aim of the paper is to analyze the impact of heterogeneous beliefs in an otherwise standard competitive complete market economy. The construction of a consensus probability belief, as well as a consensus consumer, are shown to be valid modulo an aggregation bias, which takes the form of a discount factor. In classical cases, the consensus probability belief is a risk tolerance weighted average of the individual beliefs, and the discount factor is proportional to beliefs dispersion. This discount factor makes the heterogeneous beliefs setting fundamentally different from the homogeneous beliefs setting, and it is consistent with the interpretation of beliefs heterogeneity as a source of risk. We then use our construction to rewrite in a simple way the equilibrium characteristics (market price of risk, risk premium, risk-free rate) in a heterogeneous beliefs framework and to analyze the impact of beliefs heterogeneity. Finally, we show that it is possible to construct specific parametrizations of the heterogeneous beliefs model that lead to globally higher risk premia, lower risk-free rates, and risk premia that are lower for assets with higher belief dispersion.

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    File URL: http://basepub.dauphine.fr/xmlui/bitstream/123456789/78/1/Jouini_40.pdf
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    Paper provided by Paris Dauphine University in its series Economics Papers from University Paris Dauphine with number 123456789/78.

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    Date of creation: Oct 2007
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    Publication status: Published in The Review of Economic Studies, 2007, Vol. 74, no. 4. pp. 1149-1174.Length: 25 pages
    Handle: RePEc:dau:papers:123456789/78
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