经济与社会科学2025nber.org
供给约束无法解释美国各城市的房价与数量增长
Supply constraints do not explain house price, quantity growth across US cities
进阶 · 约 90 分钟读完前置知识：城市经济学基础、计量经济学识别方法、美国住房市场背景
导读
这篇 NBER 论文利用美国城市数据，考察住房供给约束能否解释不同城市之间房价与住房数量增长的差异；结论是供给约束并不是主要解释因素。它从而挑战了“限制新建导致房价上涨”的常见叙事，但具体识别策略和样本范围需以论文原文为准。
HN 关注点：HN 读者长期争论住房可负担性究竟该归咎于供给约束、区划限制还是住房的投资属性，这篇论文直接挑战供给约束解释，因而引发讨论。
HN 评论精选
这几条评论里：质疑 2 补充 1 亲历 1
质疑批评论文数据偏重单户住宅且只从1980年开始，限制了结论外推。
这篇论文主要用单户住宅重复销售指数和美国社区调查的中位房价等数据，关注单户住宅的价格与数量。这个口径没有充分覆盖多户住宅和租赁市场，而后者受供给约束影响更大；因此其结论对密集城市等不同住房市场的可推广性受限。论文数据也只回溯到1980年，但1980—2025年的供给约束差异远小于1965—1980年；以洛杉矶为例，许多都市区的规划容量在1970年代中期已大幅削减。
jlhawn查看英文原文
This paper primarily considers house prices and quantities in terms of single-family homes. They use data sources like the single-family repeat-sales index and the median home value from the American Community Survey, which mostly tracks single-family homes. This focus limits their analysis by not fully accounting for multi-family housing units or rental markets, which are far more significantly impacted by supply constraints. This emphasis on single-family homes in their data sources affects the generalizability of their conclusions about the impact of supply constraints across different types of housing markets, especially in dense urban areas where multi-family units and rentals are more prevalent. They also only go as far back as 1980. The difference between supply constraints between 1980 and 2025 is very small compared to the difference between 1965 and 1980. Take Los Angeles as an example [1]. The zoned capacity of many metro areas was dramatically reduced by the mid 1970s. [1] https://www.lewis.ucla.edu/wp-content/uploads/sites/17/2020/02/pasted-image-0-2-768x576.png
补充认为住房作为中下层主要财富储存造成投资属性与可负担性的政治经济死结。
美国/西方精英几乎完美地通过住房政策巩固了自身权力。住房是中下层的主要财富储存形式，多数中下层会把人生中很多年的大块收入投进去。供给增加会让已有房主财富立刻缩水，因为买家选择更多；供给不增或跟不上，则住房越来越不可负担，已有房主的财富上升。对社会最好的是让房产财富缩水、使住房可负担并失去主要财富储存地位，但短期对中产打击巨大，政治上完全不可行。因此住房政策讨论几乎无法基于现实，因为除最富者外几乎所有人都受损。“住房要么是投资品，要么可负担。”几乎所有有权势或机构声誉的人都既有既得利益维持现状，又想让人们相信房价问题主要怪任何东西，唯独不怪供需基本理论。
hayst4ck查看英文原文
The American/western aristocracy has nearly perfectly entrenched their power with housing policy. Housing is the major wealth store for the middle and lower class. Most in the middle and lower class will spend major portions of their income on this for many years of their life. If supply goes up, then the middle and lower class loses significant amounts of their wealth immediately since buyers have more options. If supply goes down or fails to keep up, then housing becomes increasingly unaffordable and the wealth of people who already own goes up. What's best for society is if everyone who's wealth is tied up in property takes a hit to their wealth so that housing becomes affordable and loses it's status as primary wealth store, but that would be devastating in the short term to the middle class and therefore completely politically untenable. So because housing policy discussion takes place under these conditions, it's nearly impossible to have a reality based discussion because almost everybody loses except societies richest. "Housing can either be an investment or affordable." Almost everyone in any position of power or with institutional reputation has an extremely vested interest in both keeping the broken status quo and convincing people that absolutely anything other then basic economic theory of supply and demand is chiefly responsible for housing prices.
质疑坚持供给不足使房价被收入与信贷能力推到上限。
收入决定房价，因为供给不足。供给不足时，现有存量房会被竞标到人们能支付的最高价（很大程度上由银行决定）。这就像经济学的基本基石！
plantain查看英文原文
Income determines house prices because there is not enough supply. Without enough supply, what stock is available gets bid up to the maximum people can pay (largely decided by banks). This is like a basic cornerstone of economics!
亲历以亲历者视角怀疑评估师缺乏监管地推高房价。
我2000年代初住在北加州那些最早房价飙升的社区，一直有个个人理论：评估师发现每套房估值可以多加1万美元，而且没人会阻止；中介喜欢，因为佣金更高；买家看到房价涨得快，觉得得赶紧上车；紧俏市场里评估师被叫回的次数更多，大家都赚钱。而评估行业当时根本没有监管。
dogline查看英文原文
As somebody who lived in Northern California in the communities which first started spiking in the early 2000's, I've always had a pet theory from the time. Housing Appraisers realized they could tack on $10k per house when appraising, and they realized that nobody would stop them. Realtors loved that because they got more commission, buyers realized that houses were going up fast so they'd better get in while they could, appraisers got called back more in a tight market and everybody made money. There were *no* controls on the appraising.
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