Precision may harm: The comparative statics of imprecise judgement
Article [Version of Record]
Is part ofCahier de recherche ; no. 2018-08.
Publisher(s)Université de Montréal. Département de sciences économiques.
We consider an agent whose information about the objects of choice is imperfect in two respects: ﬁrst, their values are perceived with ‘error’; and, second, the realised values cannot be discriminated with absolute ‘precision’. Reasons for imprecise discrimination include limitations in sensory perception, memory function, or the technology that experts use to communicate with decision-makers. We study the eﬀect of increasing precision on the quality of decision-making. When values are perceived ‘without’ error, more precision is unambiguously beneﬁcial. We show that this ceases to be true when values are perceived ‘with’ error. As a practical implication, our results establish conditions where it is counter-productive for an expert to use a ﬁner signalling scheme to communicate with a decision-maker.