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Public Economics Lectures Part 1: Introduction

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Effi ciency Cost: Marshallian Surplus<br />

1. In terms of supply and demand elasticities:<br />

EB = 1 2 dQdτ<br />

EB = 1 2 S ′ (p)dpdτ = (1/2)(pS ′ /S)(S/p) dτ 2<br />

η S<br />

− η D<br />

EB = 1 2<br />

η S<br />

η D<br />

η S<br />

− η D<br />

pQ( dτ<br />

p )2<br />

Note: second line uses incidence formula dp = (<br />

η S −η<br />

)dτ<br />

D<br />

Tax revenue R = Qdτ<br />

Useful expression is deadweight burden per dollar of tax revenue:<br />

EB<br />

R = 1 η S<br />

η D dτ<br />

2 η S<br />

− η D<br />

p<br />

<strong>Public</strong> <strong>Economics</strong> <strong>Lectures</strong> () <strong>Part</strong> 3: Effi ciency 12 / 105<br />

η D<br />

η D

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