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Optimism, pessimism and financial bubbles

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  • Bertrand Wigniolle

    ()
    (CES - Centre d'économie de la Sorbonne - CNRS : UMR8174 - Université Paris I - Panthéon-Sorbonne, EEP-PSE - Ecole d'Économie de Paris - Paris School of Economics - Ecole d'Économie de Paris)

Abstract

This paper shows that it is possible to extend the scope of the existence of rational bubbles when uncertainty is introduced associated with rank-dependent expected utility. This RDU assumption can be viewed as a transformation of probabilities depending on the pessimism/optimism of the agent. The results show that pessimism favors the existence of deterministic bubbles, when optimism may promote the existence of stochastic bubbles. Moreover, under pessimism, the RDU assumption may generate multiple bubbly equilibria. The RDU assumption also leads to new conditions ensuring the (absence of) Paretooptimality of the competitive equilibrium without bubbles. These conditions still govern the existence of bubbles.

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Paper provided by HAL in its series Université Paris1 Panthéon-Sorbonne (Post-Print and Working Papers) with number halshs-00974144.

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Date of creation: Apr 2014
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Publication status: Published, Journal of Economic Dynamics and Control, 2014, 41, 188-208
Handle: RePEc:hal:cesptp:halshs-00974144

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Keywords: Rational bubbles; RDU preferences;

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Citations

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Cited by:
  1. Lise Clain-Chamosset-Yvrard & Thomas Seegmuller, 2013. "The Stabilizing Virtues of Fiscal vs. Monetary Policy on Endogenous Bubble Fluctuations," Working Papers halshs-00854536, HAL.
  2. Bertrand Wigniolle, 2014. "Optimism, pessimism and financial bubbles," Université Paris1 Panthéon-Sorbonne (Post-Print and Working Papers) halshs-00974144, HAL.
  3. Thomas Seegmuller & Lise Clain-Chamosset-Yvrard, 2013. "The Stabilizing Virtues of Fiscal vs. Monetary Policy on Endogenous Bubble Fluctuations," AMSE Working Papers 1343, Aix-Marseille School of Economics, Marseille, France, revised 17 Aug 2013.
  4. Lise Clain-Chamosset-Yvrard & Thomas Seegmuller, 2012. "Rational Bubbles and Macroeconomic Fluctuations. The(De-)Stabilizing Role of Monetary Policy," AMSE Working Papers 1207, Aix-Marseille School of Economics, Marseille, France, revised 23 Mar 2012.

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