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Public Economics Lectures Part 1: Introduction

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Ramsey Formula: Perturbation Argument<br />

Suppose government increases τ i by dτ i<br />

Effect of tax increase on social welfare is sum of effect on government<br />

revenue and private surplus<br />

Marginal effect on government revenue:<br />

Marginal effect on private surplus:<br />

dR = x i dτ i + ∑ τ j dx j<br />

j<br />

dU = ∂V<br />

∂q i<br />

dτ i<br />

= −αx i dτ i<br />

Optimum characterized by balancing the two marginal effects:<br />

dU + λdR = 0<br />

<strong>Public</strong> <strong>Economics</strong> <strong>Lectures</strong> () <strong>Part</strong> 4: Optimal Taxation 14 / 121

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