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Public Economics Lectures Part 1: Introduction

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PGs with Distortionary Taxes: 2nd Best<br />

In second best, lump sum tax unavailable (R = 0).<br />

Govt chooses τ to maximize:<br />

W = wl(1 − τ) − l k+1 /(k + 1) + v(wlτ)<br />

Using the envelope theorem yields f.o.c. for τ:<br />

0 = ∂W /∂τ = −wl + v ′ (G )(wl − wτ∂l/∂(1 − τ))<br />

⇒ 1 = v ′ (G )[1 − τ<br />

1 − τ e]<br />

Added term<br />

τ<br />

1−τ<br />

e in formula relative to Samuelson rule<br />

v ′ (G SB ) > v ′ (G FB ) = 1 which implies G SB < G FB because v(G ) is<br />

concave<br />

Higher threshold (MCPF > 1): depends on e.<br />

<strong>Public</strong> <strong>Economics</strong> <strong>Lectures</strong> () <strong>Part</strong> 7: <strong>Public</strong> Goods and Externalities 67 / 138

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