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Public Economics Lectures Part 1: Introduction

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Measurement Error and Division Bias<br />

Mis-measurement of hours causes a spurious link between hours and<br />

wages<br />

Estimate a regression of the following form:<br />

log l = β 1<br />

+ β 2<br />

log w + ε<br />

Then<br />

E ̂β 2<br />

=<br />

cov(log l, log w)<br />

var(log w)<br />

= cov(log l ∗ + µ, log w ∗ − µ)<br />

var(log w) + var(µ)<br />

Problem: E ̂β 2 ̸= ε because orthogonality restriction for OLS violated<br />

Ex. workers with high mis-reported hours also have low imputed<br />

wages, biasing elasticity estimate downward<br />

Solution: tax instruments again<br />

<strong>Public</strong> <strong>Economics</strong> <strong>Lectures</strong> ()<strong>Part</strong> 5: Income Taxation and Labor Supply 11 / 217

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