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Public Economics Lectures Part 1: Introduction

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Proof of Production Effi ciency Result<br />

Suppose X (q ∗ ) is in the interior of H<br />

Then take a commodity i that is desired by everybody, and decrease<br />

tax on i by dτ i<br />

Then X (q ∗ − dτ i ) ∈ H for dτ i small by continuity of demand<br />

functions; so it is a feasible point<br />

Everybody is better because of that change:<br />

dV h = −V h q i<br />

dτ i = V h R x h<br />

i dτ i<br />

This implies that q ∗ is not the optimum. Q.E.D.<br />

<strong>Public</strong> <strong>Economics</strong> <strong>Lectures</strong> () <strong>Part</strong> 4: Optimal Taxation 40 / 121

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