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Public Economics Lectures Part 1: Introduction

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Atkinson-Stiglitz: Intuition<br />

With separability and homogeneity, conditional on earnings z,<br />

consumption choices c = (c 1 , .., c K ) do not provide any information<br />

on ability<br />

Differentiated commodity taxes t 1 , .., t K create a tax distortion with<br />

no benefit<br />

Better to do all the redistribution with the individual income tax<br />

With only linear income taxation (Diamond-Mirrlees 1971, Diamond<br />

1975), diff. commodity taxation can be useful to “non-linearize” the<br />

tax system<br />

But not if Engel curves for each c k are linear in y (Deaton 1981)<br />

<strong>Public</strong> <strong>Economics</strong> <strong>Lectures</strong> () <strong>Part</strong> 4: Optimal Taxation 84 / 121

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