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Public Economics Lectures Part 1: Introduction

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Rothschild-Stiglitz: Equilibrium<br />

Definition<br />

An equilibrium is defined by a set of insurance contracts such that<br />

(1) individuals optimize: both types cannot find a better contract than the<br />

ones they chose<br />

(2) firms optimize: all firms earn zero profits<br />

Two types of equilibrium:<br />

1 Pooling: both types are offered the same contract α.<br />

2 Separating: high-risk types choose a contract α H while low-risk types<br />

choose a different contract α L .<br />

<strong>Public</strong> <strong>Economics</strong> <strong>Lectures</strong> () <strong>Part</strong> 6: Social Insurance 14 / 207

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