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Optimism, pessimism and financial bubbles

  • 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)

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
Note: View the original document on HAL open archive server: http://halshs.archives-ouvertes.fr/halshs-00974144
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  6. Bertrand Wigniolle, 2012. "Optimism, pessimism and financial bubbles," Documents de travail du Centre d'Economie de la Sorbonne 12005, Université Panthéon-Sorbonne (Paris 1), Centre d'Economie de la Sorbonne.
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  26. Paul A. Samuelson, 1958. "An Exact Consumption-Loan Model of Interest with or without the Social Contrivance of Money," Journal of Political Economy, University of Chicago Press, vol. 66, pages 467.
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