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Public Economics Lectures Part 1: Introduction

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Econometric Problem 3: Selection into Labor Force<br />

Consider model with fixed costs of working, where some individuals<br />

choose not to work<br />

Wages are unobserved for non-labor force participants<br />

Thus, OLS regression on workers only includes observations with<br />

l i > 0<br />

This can bias OLS estimates: low wage earners must have very high<br />

unobserved propensity to work to find it worthwhile<br />

Requires a selection correction (e.g. Heckit, Tobit, or ML estimation)<br />

See Killingsworth and Heckman (1986) for implementation<br />

Current approach: use panel data to distinguish entry/exit from<br />

intensive-margin changes<br />

<strong>Public</strong> <strong>Economics</strong> <strong>Lectures</strong> ()<strong>Part</strong> 5: Income Taxation and Labor Supply 12 / 217

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