Revealed Preference, Rational Inattention, and Costly Information Acquisition

We develop a revealed preference test for optimal acquisition of costly information. The test encompasses models of rational inatten-tion, sequential signal processing, and search. We provide limits on the extent to which attention costs can be recovered from choice data. We experimentally elicit state dependent stochastic choice data of the form the tests require. In simple cases, tests con\u85rm that subjects adjust their attention in response to incentives as the theory dictates.