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Public Economics Lectures Part 1: Introduction

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Does not emerge in Atkinson-Stiglitz because all income is earned in<br />

first period<br />

<strong>Public</strong> <strong>Economics</strong> <strong>Lectures</strong> () <strong>Part</strong> 4: Optimal Taxation 89 / 121<br />

Chamley-Judd vs. Atkinson-Stiglitz<br />

Chamley-Judd: constrained policy instruments (linear taxes) but<br />

dynamic<br />

Atkinson-Stiglitz: full set of policy instruments (non linear income<br />

tax) but static<br />

New dynamic public finance literature: full set of instruments in<br />

dynamic model<br />

Key result: in dynamic Mirrlees models, optimal capital tax is not<br />

zero (Golosov, Kocherlekota, and Tsyvinski 2003)<br />

Optimum satisfies Inverse Euler eqn., resulting in a wedge between<br />

MRS and MRTS<br />

Intuition: payoff to distorting savings decisions relaxes IC constraints in<br />

optimal income tax problem in next period

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