Econometrica · 2025 · Scott T. Nelson
中文摘要
2009年《信用卡法案》（CARD Act）限制了信用卡贷款机构依据新信息提高借款人利率的能力。此后，定价对反映借款人风险和需求特征的公共及私人信号的响应程度下降，价格离散度下降了三分之一。本文估计了这种向更趋混合(pooled)定价转变所产生的效率与分配效应。高风险及价格缺乏弹性的消费者面临的价格下降，但市场其他部分的价格上升，且对于超过30%的最安全次级借款人而言，新价格已超过其支付意愿。总体而言，平均成交价格下降，各信用评分段的消费者剩余均有所上升。消费者剩余的提高部分源于贷款机构利润下降，部分源于该法案为借款人提供的保险价值——借款人在违约风险发生不利变化后仍可保留有利定价。CARD法案实施前相对较高的加价水平，是实现这些剩余增益的关键。
Abstract
The 2009 CARD Act limited credit card lenders' ability to raise borrowers' interest rates on the basis of new information. Pricing became less responsive to public and private signals of borrowers' risk and demand characteristics, and price dispersion fell by one‐third. I estimate the efficiency and distributional effects of this shift toward more pooled pricing. Prices fell for high‐risk and price‐inelastic consumers, but prices rose elsewhere in the market and newly exceeded willingness to pay for over 30% of the safest subprime borrowers. On net, average traded prices fell and consumer surplus rose at all credit scores. Higher consumer surplus was partly driven by a fall in lender profits, and partly by the Act's insurance value to borrowers who could retain favorable pricing after adverse changes to their default risk. The relatively high level of pre‐CARD‐Act markups was crucial for realizing these surplus gains.