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Public Economics Lectures Part 1: Introduction

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Feldstein: Econometric Criticisms<br />

DD can give very biased results when elasticity differ by groups<br />

Suppose that the middle class has a zero elasticity so that<br />

∆ log(z M ) = 0<br />

Suppose high income individuals have an elasticity of e so that<br />

∆ log(z H ) = e∆ log(1 − τ H )<br />

Suppose tax change for high is twice as large:<br />

∆ log(1 − τ M ) = 10% and ∆ log(1 − τ H ) = 20%<br />

Estimated elasticity ê = e·20%−0<br />

20%−10% = 2e<br />

<strong>Public</strong> <strong>Economics</strong> <strong>Lectures</strong> ()<strong>Part</strong> 5: Income Taxation and Labor Supply 160 / 217

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