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Public Economics Lectures Part 1: Introduction

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Two Approaches to Optimal Social Insurance<br />

1 Structural: specify complete models of economic behavior and<br />

estimate the primitives<br />

Identify b ∗ as a fn. of discount rates, nature of borrowing constraints,<br />

informal ins. arrangements.<br />

Challenge: diffi cult to identify all primitive parameters in an empirically<br />

compelling manner given unobserved heterogeneity<br />

2 Suffi cient Statistic: derive formulas for b ∗ as a fn. of high-level<br />

elasticities<br />

These elasticities can be estimated using reduced-form methods<br />

Estimate statistical relationships using quasi-experimental research<br />

designs<br />

Baily-Chetty solution described below is one example<br />

<strong>Public</strong> <strong>Economics</strong> <strong>Lectures</strong> () <strong>Part</strong> 6: Social Insurance 44 / 207

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