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Public Economics Lectures Part 1: Introduction

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Adverse Selection as a Motivation for SI<br />

Key paper: Rothschild and Stiglitz (1976); see MWG Ch. 13 for a<br />

good review<br />

Consider an environment with asymmetric information, e.g.<br />

individuals know risk of losing job but insurer does not<br />

Main result: can lead to market failure where no equilibrium supports<br />

provision of insurance<br />

Government intervention through mandated insurance can increase<br />

welfare<br />

<strong>Public</strong> <strong>Economics</strong> <strong>Lectures</strong> () <strong>Part</strong> 6: Social Insurance 10 / 207

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