Type
Article
Titre
Local Utility and Risk Aversion
Dans
Mathematics of Operations Research
Auteur(s)
GALICHON Alfred - Department of Economics, Ecole Polytechnique (Auteur)
CHARPENTIER Arthur - Université de Rennes 1 (Auteur)
HENRY Marc - Départment de sciences économiques (Auteur)
Volume
Forthcoming
ISSN
0364765X
Mots clés
Local utility, Multivariate risk aversion, Pessimism, Multivariate rand dependent utility, Multivariate Bickel-Lehmann dispersion
Résumé
EN
We revisit Machina's local utility as a tool to analyze attitudes to multivariate risks. Using martingale embedding techniques, we show that for non-expected utility maximizers choosing between multivariate prospects, aversion to multivariate mean preserving increases in risk is equivalent to the concavity of the local utility functions, thereby generalizing Machina's result in Machina (1982). To analyze comparative risk attitudes within the multivariate extension of rank dependent expected utility of Galichon and Henry (2011), we extend Quiggin's monotone mean and utility preserving increases in risk and show that the useful characterization given in Landsberger and Meilijson (1994) still holds in the multivariate case.

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