Belief revision generalized: A joint characterization of Bayes's and Jeffrey's rules

Journal of Economic Theory 162:352-371 (2016)
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We present a general framework for representing belief-revision rules and use it to characterize Bayes's rule as a classical example and Jeffrey's rule as a non-classical one. In Jeffrey's rule, the input to a belief revision is not simply the information that some event has occurred, as in Bayes's rule, but a new assignment of probabilities to some events. Despite their differences, Bayes's and Jeffrey's rules can be characterized in terms of the same axioms: "responsiveness", which requires that revised beliefs incorporate what has been learnt, and "conservativeness", which requires that beliefs on which the learnt input is "silent" do not change. To illustrate the use of non-Bayesian belief revision in economic theory, we sketch a simple decision-theoretic application.
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A New Resolution of the Judy Benjamin Problem.Douven, Igor & Romeijn, Jan-Willem
Updating Subjective Probability.Diaconis, Persi & Zabell, Sandy L.

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