Is it possible to guarantee that the mere exposure of a subject to a belief elicitation task will not affect the very same beliefs that we are trying to elicit? In this paper, we introduce mechanisms that make it simultaneously strictly dominant for the subject (a) not to acquire any information that could potentially lead to belief updating as a response to the incentives provided by the mechanism itself, and (b) to report his beliefs truthfully. Such mechanisms are calledrobust scoring rules. We prove that robust scoring rules always exist under mild assumptions on the subject's costs for acquiring information. Moreover, every scoring rule can become approximately robust, in the sense that if we scale down the incentives sufficiently, we will approximate with arbitrary precision the beliefs that the subject would have held if he had not been confronted with the belief-elicitation task.
- c91 - Design of Experiments: Laboratory, Individual
- d81 - Criteria for Decision-Making under Risk and Uncertainty
- d82 - "Asymmetric and Private Information; Mechanism Design"
- d83 - "Search; Learning; Information and Knowledge; Communication; Belief"
- d87 - Neuroeconomics
- Noninvasive belief elicitation
- prior beliefs
- rational inattention
- Shannon entropy
- population beliefs
- RATIONAL INATTENTION
- SUBJECTIVE PROBABILITIES