最低工资对青年就业的影响：基于美国州级差异的证据

研究问题

最低工资提高10%是否显著减少青少年就业率？不同行业是否存在异质性效应？

核心结论

每提高10%最低工资，青少年总体就业下降约1.2个百分点，但效应高度集中在餐饮和零售业；制造业与服务业未发现统计显著影响。

方法

摘要原文

This paper examines the employment effects of minimum wage increases using state-level variation across the United States from 2000 to 2023. Employing difference-in-differences and event-study designs, we find that a 10% increase in the minimum wage reduces teenage employment by approximately 1.2 percentage points, with effects concentrated in the restaurant and retail sectors. We find no statistically significant effects in manufacturing or services. Our results suggest that the disemployment effects of minimum wages are smaller and more sector-specific than often claimed, and that aggregate employment effects mask substantial heterogeneity across industries.

开篇段落

The minimum wage remains one of the most contentious policy instruments in labor economics. Since the seminal work of Card and Krueger (1994), a vast empirical literature has sought to estimate the causal effect of minimum wage hikes on employment, with results ranging from large negative effects to zero or even positive estimates. This lack of consensus reflects genuine methodological challenges: minimum wage changes are endogenous to local economic conditions, the treatment intensity varies across workers and firms, and general equilibrium effects may offset partial equilibrium disemployment. In this paper, we leverage three decades of state-level variation in U.S. minimum wages to provide new estimates that address each of these concerns.（节选）

本文贡献

This paper makes three main contributions. First, we construct a novel panel dataset that tracks minimum wage changes at the state-quarter level linked to individual-level employment outcomes from the CPS, allowing us to estimate both extensive and intensive margin responses. Second, we show that the canonical two-way fixed effects estimator substantially overstates disemployment effects when treatment effects are heterogeneous across cohorts; our event-study and stacked DID specifications yield smaller and more precisely estimated effects. Third, we provide the first systematic evidence that sectoral reallocation—workers moving from affected to unaffected industries—accounts for approximately 40% of the gross job loss in exposed sectors, a margin absent from most prior work.

结论节选（来源：Conclusion）

Taken together, our results paint a nuanced picture: minimum wage increases do reduce employment among teenagers and low-skill workers, but the effects are modest (around 1.2% per 10% wage increase) and concentrated in specific sectors. Importantly, we find evidence of substantial worker reallocation across industries, suggesting that aggregate employment effects overstate the welfare consequences for affected workers. Policymakers should weigh these modest disemployment effects against the documented earnings gains for workers who retain employment.

研究局限

• ●无法区分全职与兼职岗位的减少，可能低估工时调整
• ●外部有效性主要限于美国州级数据，跨国推广需谨慎
• ●未捕捉企业进入/退出市场的长期一般均衡效应

未来方向

• →使用个体面板数据追踪工人跨行业流动的长期收入轨迹
• →结合企业层面数据研究最低工资对企业进入退出的影响
• →扩展到发展中国家背景，验证结论的外部有效性