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Public Economics Lectures Part 1: Introduction

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Chetty 2008: Moral Hazard vs. Liquidity Decomposition<br />

Benefit effect can be decomposed into two terms:<br />

∂s t /∂A t = {u ′ (c e t ) − u ′ (c u t )}/ψ ′′ (s t ) < 0<br />

∂s t /∂w t = u ′ (c e t )/ψ ′′ (s t ) > 0<br />

⇒ ∂s t /∂b t = ∂s t /∂A t − ∂s t /∂w t<br />

∂s t /∂A t is “liquidity effect”<br />

∂s t /∂w t is “moral hazard” or price effect<br />

Liquidity and total benefit effects smaller for agents with better<br />

consumption smoothing capacity<br />

<strong>Public</strong> <strong>Economics</strong> <strong>Lectures</strong> () <strong>Part</strong> 6: Social Insurance 78 / 207

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