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Rational Inattention via Ignorance Equivalence
We present a novel approach to finite Rational Inattention (RI) models basedon the ignorance equivalent, a fictitious action with state-dependent payoffsthat effectively summarizes the optimal learning and conditional choices. Theignorance equivalent allows us to recast the RI problem as a standard expectedutility maximization over an augmented choice set called the learning-proofmenu, yielding new insights regarding the behavioral implications of RI, inparticular as new actions are added to the menu. Our geometric approach isalso well suited to numerical methods, outperforming existing ...