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Public Economics Lectures Part 1: Introduction

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Sandmo 1975: Additivity Result<br />

Main result: can express optimal tax rate as Ramsey rate plus<br />

Pigouvian correction.<br />

Consider case where Slutsky matrix is diagonal (zero cross-price<br />

elasticities)<br />

Then optimal tax on good i, τ i satisfies<br />

τ i − τ ip<br />

1 + τ i<br />

= (θ/λ)/ɛ c ii<br />

⇒ τ i = θx i<br />

c<br />

λ /dxc i<br />

+ τ ip<br />

dp i<br />

= τ ip + τ ir<br />

<strong>Public</strong> <strong>Economics</strong> <strong>Lectures</strong> () <strong>Part</strong> 7: <strong>Public</strong> Goods and Externalities 111 / 138

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