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Public Economics Lectures Part 1: Introduction

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Instrumental Variable Methods<br />

Another strategy to overcome endogeneity is instrumenting for wage<br />

rate<br />

Mroz (1987): often-cited survey/meta-analysis of earlier studies<br />

Uses PSID to test widely-used IV’s for married women’s wage<br />

l i = α + βw + γX + ε<br />

w = θZ + µ<br />

Uses Hausman specification/overidentification test to show that many<br />

instruments violate EZ ε = 0<br />

<strong>Public</strong> <strong>Economics</strong> <strong>Lectures</strong> ()<strong>Part</strong> 5: Income Taxation and Labor Supply 89 / 217

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