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Public Economics Lectures Part 1: Introduction

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Arrow (1951) and Single-Peaked Preferences<br />

Arrow’s Impossibility Thm: Condorect Paradox is a general problem<br />

Only social choice rule that satisfies (a) Pareto Effi ciency and (b)<br />

Independence of Irrelevant Alternatives is dictatorship.<br />

Subsequent work: restricts space of preferences to make progress<br />

Two assumptions that ensure existence of equilibrium:<br />

1 G unidimensional<br />

2 preferences over G are “single-peaked”<br />

<strong>Public</strong> <strong>Economics</strong> <strong>Lectures</strong> () <strong>Part</strong> 7: <strong>Public</strong> Goods and Externalities 23 / 138

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