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Public Economics Lectures Part 1: Introduction

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Optimal Top Income Tax Rate<br />

{<br />

}<br />

dM + dW + dB = Ndτ (1 − ḡ)[z m τ<br />

− ¯z] − ¯ε<br />

1 − τ zm<br />

Optimal τ such that dM + dW + dB = 0 ⇒<br />

τ ∗ TOP<br />

1 − τ ∗ TOP<br />

= (1 − ḡ)(z m/¯z − 1)<br />

¯ε · z m /¯z<br />

τ ∗ TOP<br />

τ ∗ TOP<br />

decreases with ḡ [redistributive tastes]<br />

decreases with ¯ε [effi ciency]<br />

τ ∗ TOP increases with z m/¯z [thickness of top tail]<br />

Note: this is not an explicit formula for top tax rate because z m /¯z is<br />

a fn. of τ<br />

<strong>Public</strong> <strong>Economics</strong> <strong>Lectures</strong> () <strong>Part</strong> 4: Optimal Taxation 64 / 121

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