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Public Economics Lectures Part 1: Introduction

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Path Dependence Problem<br />

Example of path dependence with taxes on two goods:<br />

CS 1 =<br />

CS 2 =<br />

∫ q 1<br />

1<br />

q1<br />

0<br />

∫ q 1<br />

2<br />

q 0 2<br />

∫ q 1<br />

c 1 (q 1 , q2, 0 2<br />

Z )dq 1 +<br />

q 0 2<br />

c 2 (q 1 1, q 2 , Z )dq 2 (1)<br />

∫ q 1<br />

c 2 (q1, 0 1<br />

q 2 , Z )dq 2 + c 1 (q 1 , q2, 1 Z )dq 1 (2)<br />

q1<br />

0<br />

For CS 1 = CS 2 , need dc 2<br />

dq 1<br />

= dc 1<br />

dq 2<br />

With income effects, this symmetry condition is not satisfied in<br />

general<br />

<strong>Public</strong> <strong>Economics</strong> <strong>Lectures</strong> () <strong>Part</strong> 3: Effi ciency 26 / 105

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