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Public Economics Lectures Part 1: Introduction

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Model of Externalities: Equilibrium<br />

Firms max profits:<br />

max px − c(x)<br />

Consumers max utility, taking level of pollution as fixed:<br />

max u(x) + Z − px<br />

Demand satisfies<br />

u ′ (x D ) = p<br />

Supply satisfies<br />

c ′ (x S ) = p<br />

PMB equals PMC in equilibrium:<br />

u ′ (x D ) = c ′ (x S )<br />

But this is not Pareto effi cient<br />

<strong>Public</strong> <strong>Economics</strong> <strong>Lectures</strong> () <strong>Part</strong> 7: <strong>Public</strong> Goods and Externalities 83 / 138

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