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Information acquisition and financial intermediation
Informational advantages of specialists relative to households lead to disagreement between the two in an intermediated market. Although households can acquire additional signals to reduce the informational asymmetry, the additional information is costly, making it rational for households to limit the accuracy of the signals they observe. I show that this leads the equity capital constraint to bind more frequently, making the asset prices in the economy more volatile unconditionally. When disagreement between households and specialists is high, however, return volatility decreases. I find ...
Working Paper
Rational Inattention via Ignorance Equivalence
We present a novel approach to finite Rational Inattention (RI) models based on the ignorance equivalent, a fictitious action with state-dependent payoffs that effectively summarizes the optimal learning and conditional choices. The ignorance equivalent allows us to recast the RI problem as a standard expected utility maximization over an augmented choice set called the learning-proof menu, yielding new insights regarding the behavioral implications of RI, in particular as new actions are added to the menu. Our geometric approach is also well suited to numerical methods, outperforming ...
Working Paper
Geometric Methods for Finite Rational Inattention
We present a geometric approach to the finite Rational Inattention (RI) model, recasting it as a convex optimization problem with reduced dimensionality that is well-suited to numerical methods. We provide an algorithm that outperforms existing RI computation techniques in terms of both speed and accuracy. We also introduce methods to quantify the impact of numerical inaccuracy on the behavioral predictions and to produce robust predictions regarding the most frequently implemented actions.
Working Paper
Rational Inattention via Ignorance Equivalence
We introduce the concept of the ignorance equivalent to effectively summarize the payoff possibilities in a finite Rational Inattention problem. The ignorance equivalent is a unique fictitious action that is weakly preferable to all existing learning strategies and yet generates no new profitable learning opportunities when added to the menu of choices. We fully characterize the relationship between the ignorance equivalent and the optimal learning strategies. Agents with heterogeneous priors self-select their own ignorance equivalent, which gives rise to an expected-utility analogue of the ...
Working Paper
Attention and Fluctuations in Macroeconomic Uncertainty
I show that economic agents’ attention to macroeconomic events can increase macroeconomic uncertainty during recessions. Agents face uncertainty about the aggregate state of the economy, receive dispersed information about it, and can pay attention to acquire more information. When the economy is in a bad state, agents choose to pay more attention, and their collective response increases three common measures of uncertainty: (i) aggregate output volatility, (ii) forecast dispersion about output, and (iii) subjective uncertainty about output. Uncertainty driven by agents’ attention implies ...
Working Paper
Rationally Inattentive Consumer: An Experiment
This paper presents a laboratory experiment that directly tests the theoretical predictions of consumption choices under rational inattention. Subjects are asked to select consumption when income is random. They can optimally decide to reduce uncertainty about income by acquiring signals about it. The informativeness of the signals directly relates to the cognitive effort required to process the information. We find that subjects? behavior is largely in line with the predictions of the theory: 1) Subjects optimally make stochastic consumption choices; 2) They respond to incentives and changes ...
Working Paper
Effects of Monetary Policy on Household Expectations: The Role of Homeownership
We study the role of homeownership in the effectiveness of monetary policy on households' expectations. Empirically, we find that homeowners revise down their near-term inflation expectations and their optimism about future labor market conditions in response to a rise in mortgage rates, while renters are less likely to do so. We further show that the monetary-policy component of mortgage-rate changes creates the difference in expectation revisions between homeowners and renters. This result suggests that homeowners are attentive to news on interest rates and adjust their expectations ...
Working Paper
Mechanics of Linear Quadratic Gaussian Rational Inattention Tracking Problems
This paper presents a general framework for constructing and solving the multivariate static linear quadratic Gaussian (LQG) rational inattention tracking problem. We interpret the nature of the solution and the implied action of the agent, and we construct representations that formalize how the agent processes data. We apply this infrastructure to the rational inattention price-setting problem, confirming the result that a conditional response to economics shocks is possible, but casting doubt on a common assumption made in the literature. We show that multiple equilibria and a social cost ...
Working Paper
Are Real Assets Owners Less Averse to Inflation? Evidence from Consumer Sentiments and Inflation Expectations
Using data from the University of Michigan Surveys of Consumers, we document a significant negative association between consumer sentiment and inflation expectations, controlling for prevailing inflation in the economy. We further show that consumer sentiments of homeowners and stockowners are more sensitive to expected inflation than those of other consumers, a disparity at odds with the notion that owning such assets provides hedges against inflation. Leveraging data from the Survey of Consumer Expectations, we find three factors that help account for this difference. First, assets owners' ...
Working Paper
Elastic attention, risk sharing, and international comovements
In this paper we examine the effects of elastic information-processing capacity (or optimal inattention) proposed in Sims (2010) on international consumption and income correlations in a tractable small open economy (SOE) model with exogenous income processes. We find that in the presence of capital mobility in financial markets, optimal inattention due to fixed information-processing cost lowers the international consumption correlations by generating heterogeneous consumption adjustments to income shocks across countries facing different macroeconomic uncertainty. In addition, we show that ...