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耐用品与边际支出倾向

Durables and the Marginal Propensity to Spend
American Economic Review · 2026 · Nathan Zorzi、Martin Beraja

中文摘要

耐用品在家庭边际支出倾向(MPX)中占很大比重。我们构建了一个纳入耐用品的定量支出模型,并同时匹配了一组丰富的经验规律。在耐用品边际支出倾向的人口分布、时间持续性与周期性方面,按非耐用品响应进行缩放,只能对其给出很差的近似。作为应用,我们研究了边际支出倾向如何随刺激支票金额而变化,并发现与纯非耐用品支出模型相比,其下降得更慢。

Abstract

Durables represent a large share of households' marginal propensity to spend (MPX). We develop a quantitative model of spending that takes durables into account and matches a rich set of empirical regularities simultaneously. Scaling the response of nondurables provides a poor approximation of the MPX on durables when it comes to its distribution in the population, its persistence over time, and its cyclicality. As an application, we study how the MPX varies with the size of stimulus checks and find that it declines more slowly compared to a model of purely nondurable spending.
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