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Public Economics Lectures Part 1: Introduction

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Model: Equilibrium<br />

With perfect optimization, supply fn for x is implicitly defined by the<br />

marginal condition<br />

p = c ′ (S(p))<br />

Let η S<br />

= p S ′<br />

S<br />

denote the price elasticity of supply<br />

Let Q denote equilibrium quantity sold of good x<br />

Q satisfies:<br />

Q(t) = D(p + t) = S(p)<br />

Consider effect of introducing a small tax dτ > 0 on Q and surplus<br />

<strong>Public</strong> <strong>Economics</strong> <strong>Lectures</strong> () <strong>Part</strong> 3: Effi ciency 8 / 105

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