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Public Economics Lectures Part 1: Introduction

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Rothschild-Stiglitz: Second Best Solution<br />

Type L gets as much ins. as possible without making H want to<br />

deviate at actuarially fair rate for L:<br />

√<br />

5 = 1 √<br />

100 − α L 1<br />

4<br />

+ 3 1 − p L<br />

α L 1<br />

4 p L<br />

Solving gives α L 1 = $3.85, αL 2<br />

for low risk type.<br />

= $11.55 — nowhere near full insurance<br />

Note that expected utility for low risk type is<br />

EU L = 3 4<br />

√ 1√ 100 − 3.85 + 3 · 3.85 = 8.2.<br />

4<br />

<strong>Public</strong> <strong>Economics</strong> <strong>Lectures</strong> () <strong>Part</strong> 6: Social Insurance 22 / 207

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