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财富不平等与资产价格

Wealth Inequality and Asset Prices
Review of Economic Studies · 2025 · Matthieu Gomez

中文摘要

富裕家庭在股票上的投资比例显著更高,因而股票收益会引起顶端财富不平等大幅且持续的波动。受这一观察启发,本文在一个部分经济主体(企业家)对整个经济持有杠杆头寸的模型中,研究资产价格与财富不平等的联合动态。在该模型中,与数据一致,财富分布具有随机性并呈现帕累托尾部,其尾部指数取决于顶端家庭收益率的对数平均值。该模型包含资产价格与财富不平等之间的反馈循环,从而放大总量冲击对经济的影响。依据美国数据校准后,该模型能够解释20世纪资产价格和顶端财富份额波动的相当大一部分。

Abstract

Abstract Wealthy households disproportionately invest in equity, causing equity returns to generate large and persistent fluctuations in top wealth inequality. Motivated by this observation, I study the joint dynamics of asset prices and wealth inequality in a model where a subset of agents (entrepreneurs) hold levered positions on the economy. In the model, as in the data, the wealth distribution is stochastic and it exhibits a Pareto tail, with a tail index that depends on the logarithmic average return of top households. The model features a feedback loop between asset prices and wealth inequality, which amplifies the effect of aggregate shocks on the economy. The model, calibrated to the U.S. data, can account for a substantial portion of the fluctuations in asset prices and top wealth shares over the 20th century.
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