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Public Economics Lectures Part 1: Introduction

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Optimization Frictions<br />

Many frictions may cause agents to deviate from unconstrained<br />

optimum, e.g. adjustment costs or inattention<br />

These frictions may attenuate short-run responses to tax reforms<br />

Chetty (2009) asks two questions<br />

1 Can frictions quantitatively explain micro-macro puzzle and other<br />

puzzles in labor supply literature?<br />

2 Given frictions, what can we say about the “structural” elasticity?<br />

Structural elasticity controls long run responses (e.g. Europe vs US)<br />

Example: calculate utility loss from ignoring tax changes under<br />

neoclassical model with ε = 0.5<br />

<strong>Public</strong> <strong>Economics</strong> <strong>Lectures</strong> ()<strong>Part</strong> 5: Income Taxation and Labor Supply 181 / 217

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