A Proof of Blackwell's Theorem

Eduardo Perez

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Abstract: 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.

Date: 2017-11-01
Note: View the original document on HAL open archive server: https://sciencespo.hal.science/hal-03393159
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Working Paper: A Proof of Blackwell's Theorem (2017)
Working Paper: A Proof of Blackwell's Theorem (2017)
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