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Research

 

Unpublished:

Selective Sampling with Information-Storage Constraints, with Philippe Jehiel, this draft April 2018

Presentation

A decision-maker acquires payoff-relevant information until she reaches her storing capacity, at which point she either terminates the decision-making and chooses an action, or discards some information. By conditioning the probability of termination on the information collected, she controls the correlation between the payoff state and her terminal action. We provide an optimality condition for the emerging stochastic choice. The condition highlights the benefits of selective memory applied to the extracted signals. The constrained-optimal choice rule exhibits (i) confirmation bias, (ii) speed-accuracy complementarity, (iii) overweighting of rare events, and (iv) salience effect.



On the Cost of Misperception: General Results and Behavioral Applications, with Olivier Gossner, this draft March 2018, r&r in the Journal of Economic Theory

Presentation

In a choice model, we characterize the loss induced by misperceptions of payoff-relevant parameters across a distribution of decision problems. When the agent cannot avoid misperceptions but has some control over the distribution of errors, we show that strategies that minimize loss from misperception exhibit systematic biases, akin to some documented in the behavioural and psychological literatures. We include illusion of control, anchoring, overprecision, and overweighting of small probabilities as illustrative examples.

 

Publications:

1. Rational Inattention Dynamics: inertia and delay in decision-making 2017, Econometrica 85(2), 521-553,with Colin Stewart and Filip Matějka,

Presentation, Popularizační přednáška v Češtině

We solve a general class of dynamic rational-inattention problems in which an agent repeatedly acquires costly information about an evolving state and selects actions. The solution resembles the choice rule in a dynamic logit model, but it is biased towards an optimal default rule that depends only on the history of actions, not on the realized state. We apply the general solution to the study of (i) the status quo bias; (ii) inertia in actions leading to lagged adjustments to shocks; and (iii) the tradeoff between accuracy and delay in decision-making.

2. Perceiving Prospects Properly, with Colin Stewart, 2016, American Economic Review 106, 1601-31.

PresentationSummary for press by AEA

When an agent chooses between prospects, noise in information processing generates an effect akin to the winner's curse. Statistically unbiased perception systematically overvalues the chosen action because it fails to account for the possibility that noise is responsible for making the preferred action appear to be optimal. The optimal perception pattern exhibits a key feature of prospect theory, namely, overweighting of small probability events (and corresponding underweighting of high probability events).  This bias arises to correct for the winner's curse effect. 

3. Price Price Distortions under Coarse Reasoning with Frequent Trade, with Colin Stewart, 2015, J. Econ. Theory 159, 574-595. Presentation, Supplement

4. Influential Opinion Leaders, with Colin Stewart and Antoine Loeper, 2014, Economic Journal 124, 1147–1167.

5. Tractable Dynamic Global Games and Applications, with Laurent Mathevet, 2013, J. Econ. Theory 148, 25832619. (previously circulated as “Sand in the Wheels: A Dynamic Global Game Approach”)

6. Reversibility in Dynamic Coordination Problems, with Eugen Kováč, 2013, Games and Economic Behavior 77, 298–320. (An older version)
7. Who Matters in Coordination Problems?, with József Sákovics, 2012,
American Economic Review 102(7), 3439–3461. (An older version)

8. Dynamic Coordination with Private Learning, with Amil Dasgupta and Colin Stewart, 2012, Games and Economic Behavior 74, 83–101.
9. Communication, Timing, and Common Learning, with Colin Stewart, 2011,
J. Econ. Theory 146, 230–247. (An older version), The paper explained on the blog of Jeff Ely.
10. Contagion through Learning, with Colin Stewart, 2008,
Theoretical Economics 3, 431–458.
11. Coordination of Mobile Labor, 2008,
J. Econ. Theory 139(1), 25–46. (An older version)
12. Coordination Cycles, 2008,
Games and Economic Behavior 63(1), 308–327.
13. The Effects of Risk Aversion in Mixed-Strategy Equilibria of 2x2 Games, with Dirk Engelmann, 2007,
Games and Economic Behavior 60, 381–388.
14. A Trace of Anger is Enough: On the Enforcement of Social Norms, 2007,
Economics Bulletin, vol. 8. (An expanded version)
15. Dynamic scaling and universality in evolution of fluctuating random networks,  with Kotrla M. and F. Slanina, 2002,
Europhys. Lett. 60, 1420.

 


 

 

 Essays on Roma

 

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