# Underestimation of probability modifications: characterization and economic implications

*Johanna Etner* and
*Meglena Jeleva* ()

No 2012-33, EconomiX Working Papers from University of Paris Nanterre, EconomiX

**Abstract:**
The aim of this paper is to propose a behavioral characterization of individuals who underestimate probability modifications and to characterize this behavior in the standard preferences representation models under risk (Expected utility, Dual theory, Rank Dependant Utility Theory and MaxMin Expected Utility). Our main results are the following. Underreaction to probability modifications is in general independent from standard risk aversion and prudence. In models involving probability transformation functions, it is characterized by the slope of the probability transformation function. In the MaxMin Expected utility model under risk, it is related to the weights of the maximal and minimal consequences in the preferences representation function. Considering a simple prevention decision, consisting in the reduction of the probability of a monetary loss, we show that individuals who underreact to probability modifications invest less in prevention than individuals who objectively evaluate these modifications. Underreaction to probability modification is thus a possible explanation for low investment in prevention.

**Keywords:** probability perception; non expected utility; prevention (search for similar items in EconPapers)

**JEL-codes:** D81 (search for similar items in EconPapers)

**Pages:** 18 pages

**Date:** 2012

**New Economics Papers:** this item is included in nep-evo, nep-mic and nep-upt

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**Related works:**

Working Paper: Underestimation of probability modifications: characterization and economic implications (2014)

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**Persistent link:** https://EconPapers.repec.org/RePEc:drm:wpaper:2012-33

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