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Public Economics Lectures Part 1: Introduction

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Decentralized Private Provision Suboptimal<br />

Individual h solves<br />

max U h (X h , G 1 + .. + G h + .. + G H )<br />

s.t. X h + G h = Y h .<br />

Nash equilibrium outcome is U h X = Uh G<br />

Samuelson Rule not satisfied<br />

Pareto improvement if each person invested 1/H more dollars in the<br />

public good:<br />

∆W = −U h X (1/H) + U h G = U h G (1 − 1/H) > 0.<br />

Market outcome is ineffi cient; underprovision of G<br />

<strong>Public</strong> <strong>Economics</strong> <strong>Lectures</strong> () <strong>Part</strong> 7: <strong>Public</strong> Goods and Externalities 16 / 138

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