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Public Economics Lectures Part 1: Introduction

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Feldstein Taxable Income Formula<br />

Agent’s utility is quasi-linear in consumption:<br />

Social welfare:<br />

u(c, e, l) = c − g(e) −<br />

N<br />

∑<br />

i=1<br />

ψ i<br />

(l i )<br />

W (t) = {(1 − t)TI + e − g(e) −<br />

N<br />

∑<br />

i=1<br />

Differentiating and applying envelope conditions for l i<br />

((1 − t)w i = ψ ′ i (l i )) and e (g ′ (e) = t) implies<br />

dW<br />

dt<br />

= −TI + TI − t dTI<br />

dt<br />

ψ i<br />

(l i )} + tTI<br />

= t dTI<br />

dt<br />

Intuition: marginal social cost of reducing earnings through each<br />

margin is equated at optimum → irrelevant what causes change in TI<br />

<strong>Public</strong> <strong>Economics</strong> <strong>Lectures</strong> () <strong>Part</strong> 3: Effi ciency 64 / 105

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