De Finetti’s Methods of Elicitation
De Finetti (1974) uses payoffs through promissory notes, bets, or scoring rules in the elicitation of an expert’s probabilities and introduces his “hypothesis of rigidity” to argue that as long as the payoffs are small, nonlinearities in the expert’s utility function can be ignored for practical purposes. In an analysis considering not just the elicitation-related payoffs, but all uncertainties related to the expert’s fortune, we find that the hypothesis of rigidity is not sufficient to eliminate the impact of the utility function in probability elicitation. We propose an “extended hypothesis of rigidity” that adds an extra condition to de Finetti’s hypothesis. The extra assumption is that, ignoring elicitation-related payoffs, the fortune of the expert is independent of the events for which probabilities are being elicited.
KeywordsOriginal Hypothesis Price Ratio Elicitation Method Extra Assumption Indifference Price
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- Kadane, J.B., and Winkler, R.L., 1986, Separating probability elicitation from utilities, unpublished manuscript.Google Scholar