Macroeconomics

Topical

Abstract: Rational inattention models  characterize optimal decision-making in data-rich environments.   In such environments, it can be costly to look carefully at all of the information.  Some information is much more salient for the decision at hand and merits closer scrutiny.    The inattention decision model formalizes this choice and deduces how best to navigate through the potentially vast array of data when making decisions.  In the rational formulation, the decision-maker commits fully to a subjective prior distribution over the possible states of the world that could be realized.  We relax this assumption and look for a robustly optimal solution to the inattention problem by allowing the decision-maker  to be ambiguity averse with respect to this prior.  In comparison to the rational solution with no prior uncertainty, our decision-maker slants priors in more cautious or pessimistic directions when deducing how to allocate attention over the range of available information. We explore some examples that show how the robust solution differs from the rational solution with a commitment to a subjective prior distribution and how it differs from imposing risk aversion. This is a joint work with Lars Peter Hansen and Jianjun Miao.