research

Research Statement [pdf]

 
 

Job Market Paper

Does Random Consideration Explain Behavior when Choice is Hard? Evidence from a Large-scale Experiment

with Victor Aguiar, Nail Kashaev, and Jeongbin Kim

We study population behavior when choice is hard and considering all alternatives may be costly. To simplify their choice problem, individuals may only pay attention to a subset of available alternatives. Within this framework, we compare competing models of random consideration. We design and implement a novel online experiment that exogenously varies choice sets and consideration costs for a large sample of individuals. We provide a theoretical and statistical framework that allows us to test limited and random consideration at the population level. We find that the standard random utility model fails to explain our population behavior. At the same time, our results suggest that a model of random consideration with logit attention (Brady and Rehbeck (2016)) and heterogeneous preferences provides a good explanation for our population behavior. Finally, we find that the random consideration rule that subjects use is different for different costs of consideration while preferences are not. We observe that the higher the consideration cost the further behavior is from the full consideration benchmark, supporting the negative impact of hard choices on welfare.

publications

satisficing and stochastic choice

with Victor Aguiar and Mark Dean - JET(2016)

Satisficing is a hugely influential model of boundedly rational choice, yet it cannot be easily tested using standard choice data. We develop necessary and sufficient conditions for stochastic choice data to be consistent with satisficing, assuming that preferences are fixed, but search order may change randomly. The model predicts that stochastic choice can only occur amongst elements that are always chosen, while all other choices must be consistent with standard utility maximization. Adding the assumption that the probability distribution over search orders is the same for all choice sets makes the satisficing model a subset of the class of random utility models.

working papers

POWER OF REVEALED PREFERENCE TESTS AND PREDICTIVE (UN)CERTAINTY

Revealed preference theory defines the behavioral conditions that are equivalent to many models of decision providing a nonparametric test for it. For utility maximization these conditions are given by the Generalized Axiom of Revealed Preference (GARP). For some data sets these conditions may be so unrestrictive that is (nearly) impossible to detect violations regardless of the data generating process, hindering the interpretation of the explanatory performance of the model. This paper establishes a natural trade off between fit and power in terms of their contribution to narrow down predictions if behavior is utility maximizer with error. The proposed measure exploits the connection between power and the precision to which preferences can be identified from behavior.  The less precise the identification of preferences, the bigger deviations need to be in order to be detected. This measure allows to differentiate among behavior and designs that have similar power and fit under standard measures in the literature, as shown in the empirical applications for the data sets studied by Beatty and Crawford (2011) and Choi et al (2007).

WHAT CAN BE LEARNED FROM BEHAVIOR? PREDICTIVE ABILITY IN DISCRETE CHOICE ENVIRONMENTS

 Revealed preference restrictions provide (nonparametric) testable implications for many theories of consumption. The analyst does not know the choice model but seeks to learn about it from behavior. However, learning is hindered due to identifiability issues because of incomplete data sets and/or inconsistent choices, both common in empirical studies. This paper provides a joint treatment of these in terms of the performance of the model to predict behavior given data. Incomplete data may translate into multiplicity of preferences that rationalize behavior which drives uncertainty when predicting choices. Likewise, inconsistent choices also induce noisier predictions. These two concerns relate to the power and fit problems respectively. Therefore, the predictive approach makes explicit the trade off between fit and power for revealed preference theories in terms of the predictive precision of the model given data. 

the impact of confidence on risk taking behavior and performance

with Nicholas Coleman

work in progress