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Public Economics Lectures Part 1: Introduction

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Atkinson-Stiglitz: Proof<br />

Let V (y, q) = max c v(c 1 , .., c K ) st qc ≤ y be the indirect utility of<br />

consumption given post-tax earnings y and price q<br />

This function is common across all individuals under assumptions above<br />

Start with any tax system (T (.), t)<br />

Replace (T (.), t) with ( ¯T (.), t = 0) where ¯T (z) is such that<br />

V (z − T (z), p + t) = V (z − ¯T (z), p)<br />

Utility U h (V , z) unchanged for all individuals<br />

Labor supply choices z unchanged as well because return to work<br />

V ′ (z) unchanged<br />

<strong>Public</strong> <strong>Economics</strong> <strong>Lectures</strong> () <strong>Part</strong> 4: Optimal Taxation 81 / 121

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