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Public Economics Lectures Part 1: Introduction

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Negative Marginal Tax Rates Never Optimal<br />

Suppose T ′ < 0 in band [z, z + dz]<br />

Increase T ′ by dτ > 0 in band [z, z + dz]<br />

dM + dW > 0 because G (z) < 1 for any z > 0 (with declining g(z)<br />

and G (0) = 1)<br />

dB > 0 because T ′ (z) < 0 [smaller effi ciency cost]<br />

Therefore T ′ (z) < 0 cannot be optimal<br />

Marginal subsidies also distort local incentives to work<br />

Better to redistribute using lump sum grant<br />

<strong>Public</strong> <strong>Economics</strong> <strong>Lectures</strong> () <strong>Part</strong> 4: Optimal Taxation 73 / 121

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