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Public Economics Lectures Part 1: Introduction

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Diamond and Sheshinski 1995<br />

Individuals have different disutilities of working ψ i<br />

To max social welfare, not desirable for those with high ψ i<br />

to work.<br />

First best: Individual i works iff<br />

Marginal product > ψ i<br />

But govt observes only an imperfect signal of ψ i<br />

→ sets a higher<br />

threshold for disability<br />

Result: lower benefit rate if screening mechanism has higher noise to<br />

signal ratio<br />

<strong>Public</strong> <strong>Economics</strong> <strong>Lectures</strong> () <strong>Part</strong> 6: Social Insurance 149 / 207

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