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Optimism, pessimism and financial bubbles

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) Pareto-optimality of the competitive equilibrium without bubbles. These conditions still govern the existence of bubbles.

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File URL: ftp://mse.univ-paris1.fr/pub/mse/CES2012/12005.pdf
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Paper provided by Université Panthéon-Sorbonne (Paris 1), Centre d'Economie de la Sorbonne in its series Documents de travail du Centre d'Economie de la Sorbonne with number 12005.

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Length: 37 pages
Date of creation: Feb 2012
Date of revision:
Handle: RePEc:mse:cesdoc:12005
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  5. 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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