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Public Economics Lectures Part 1: Introduction

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Weitzman Model: Policy without Uncertainty<br />

In eq’m, PMB of pollution reduction is 0 ⇒ level of pollution<br />

reduction is Q = 0.<br />

Social optimum:<br />

First order condition:<br />

max B(Q) − C (Q)<br />

C ′ (Q ∗ ) = B ′ (Q ∗ )<br />

With no uncertainty, can obtain optimum with either quantity or price<br />

policy.<br />

Quantity: require amount Q ∗ .<br />

Price: set price for pollution reduction of p ∗ = C ′ (Q ∗ ).<br />

<strong>Public</strong> <strong>Economics</strong> <strong>Lectures</strong> () <strong>Part</strong> 7: <strong>Public</strong> Goods and Externalities 97 / 138

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