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Public Economics Lectures Part 1: Introduction

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Path Dependence Problem<br />

Initial price vector q 0<br />

Taxes levied on goods →price vector now q 1<br />

Change in Marshallian surplus is defined as the line integral:<br />

CS =<br />

∫ q 1<br />

q 0<br />

c(q, Z )dq<br />

With one price changing, this is area under the demand curve<br />

Problem: CS is path dependent with > 1 price changes<br />

Consider change from q 0 to ˜q and then ˜q to q 1 :<br />

CS(q 0 → ˜q) + CS(˜q → q 1 ) ̸= CS(q 0 → q 1 )<br />

<strong>Public</strong> <strong>Economics</strong> <strong>Lectures</strong> () <strong>Part</strong> 3: Effi ciency 25 / 105

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