Type
Working paper
Title
A Proof of Blackwell's Theorem
In
Sciences Po Economics Discussion Papers
Editor
Paris : Département d'économie de Sciences Po
Collection
Sciences Po Economics Discussion Papers : 2017-06
Abstract
EN
This note gives a new proof of Blackwell’s celebrated result. The result is a bit stronger than the classical version since the action set and the prior are fixed, and only the utility of the decision maker varies. I show directly that a decision maker has access to a larger set of joint distributions over actions and states of the world if and only if her information improves in the garbling order.

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