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Public Economics Lectures Part 1: Introduction

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Optimal Top Income Tax Rate<br />

Now consider constant mtr τ above fixed income threshold ¯z<br />

Derive optimal τ using perturbation argument<br />

Assume away income effects ε c = ε u = ε<br />

Diamond (1996) shows this is a key theoretical simplification<br />

Assume that there are N individuals above ¯z<br />

Denote by z m (1 − τ) their average income, which depends on<br />

net-of-tax rate 1 − τ<br />

<strong>Public</strong> <strong>Economics</strong> <strong>Lectures</strong> () <strong>Part</strong> 4: Optimal Taxation 61 / 121

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