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Public Economics Lectures Part 1: Introduction

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Saez 2009: Bunching at Kinks<br />

Saez observes that only non-parametric source of identification for<br />

elasticity in a cross-section is amount of bunching at kinks<br />

All other tax variation is contaminated by heterogeneity in tastes<br />

Develops method of using bunching at kinks to estimate the<br />

compensated taxable income elasticity<br />

Idea: if this simple, non-parametric method does not recover positive<br />

compensated elasticities, then little value in additional structure of<br />

NLBS models<br />

Formula for elasticity:<br />

ε c =<br />

dz/z ∗ excess mass at kink<br />

=<br />

dt/(1 − t) % change in NTR<br />

<strong>Public</strong> <strong>Economics</strong> <strong>Lectures</strong> ()<strong>Part</strong> 5: Income Taxation and Labor Supply 29 / 217

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