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Public Economics Lectures Part 1: Introduction

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Goulder and Williams 2003<br />

Show that ignoring cross effects by using one-good formula can be<br />

very misleading<br />

Differentiate multiple-good Harberger formula w.r.t. τ k :<br />

dEB<br />

dτ k<br />

dh<br />

= k dh i<br />

−τ k − ∑ τ i<br />

dτ k i̸=k dτ k<br />

If τ k is small (e.g. gas tax), what matters is purely distortion in other<br />

markets, e.g. labor supply<br />

As τ k → 0, error in single-market formula approaches ∞<br />

<strong>Public</strong> <strong>Economics</strong> <strong>Lectures</strong> () <strong>Part</strong> 3: Effi ciency 47 / 105

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