We examine in this paper a new natural restriction on utility functions, namely that an undesirable risk can never be made desirable by the presence of an independent, unfair risk. This concept is called weak properness. It generalizes the concept of properness (individually undesirable, independent risks are always jointly undesirable) introduced by Pratt and Zeckhauser [1987]. An important property of weak properness and properness is that adding an unfair risk to wealth makes risk-averse people more risk averse, therefore increasing the equilibrium price of risk in exchange economies a la Lucas [1978]. Weak properness implies that the two first derivatives of the utility function are concave transformations of the original utility function. A sufficient condition for weak-properness is that absolute risk aversion be decreasing and convex.
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Paper provided by Risk and Insurance Archive in its series Working Papers with number
018.
References listed on IDEAS Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.:
Pratt, John W & Zeckhauser, Richard J, 1987.
"Proper Risk Aversion,"
Econometrica,
Econometric Society, vol. 55(1), pages 143-54, January.
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Cited by: (explanations, Please report citation or reference errors to , or , if you are the registered author of the cited work, log in to your RePEc Author Service profile, click on "citations" and make appropriate adjustments.)
Luigi Guiso & Tullio Jappelli, 2000.
"Household Portfolios in Italy,"
CSEF Working Papers
43, Centre for Studies in Economics and Finance (CSEF), University of Naples, Italy.
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Other versions:
Günter Franke & Richard C. Stapleton & Marti G. Subrahmanyam, 2005.
"Incremental Risk Vulnerability,"
CoFE Discussion Paper
05-08, Center of Finance and Econometrics, University of Konstanz.
[Downloadable!]