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Public Economics Lectures Part 1: Introduction

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Discrete Choice Model<br />

Two good model<br />

Agents have value V k for good 1; can either buy or not buy<br />

Let F (V ) denote distribution of valuations<br />

Utility of agent k is<br />

V k x 1 + Z − (p + t)x 1<br />

Social welfare:<br />

∫<br />

W (t) = { max[V k x k<br />

V k x1<br />

k 1 + Z − (p 1 + t)x1 k ]dF (V k )}<br />

∫<br />

+ tx1 k dF (V k )<br />

V k<br />

This problem is not smooth at individual level, so cannot directly<br />

apply envelope thm. as stated<br />

<strong>Public</strong> <strong>Economics</strong> <strong>Lectures</strong> () <strong>Part</strong> 3: Effi ciency 58 / 105

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