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Public Economics Lectures Part 1: Introduction

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Optimization Frictions<br />

Define agent i’s “optimization error” as difference between observed<br />

and optimal demand:<br />

φ i<br />

= log x i (p) − log x ∗<br />

i (p)<br />

Observed demand can be written as<br />

log x i (p) = α − ε log p + ν i + φ i<br />

Difference between optimization error (φ i<br />

) and preference<br />

heterogeneity error (v i ): do not know distribution of φ i<br />

Want to remain agnostic about Eφ i |p<br />

Without restrictions on φ i<br />

, observed response does not identify ε<br />

<strong>Public</strong> <strong>Economics</strong> <strong>Lectures</strong> ()<strong>Part</strong> 5: Income Taxation and Labor Supply 187 / 217

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