Instrumental variable regression with varying-intensity repeated treatments
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强度变化的重复处理下的工具变量回归AI 解读 ↓
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Instrumental variable models with repeated endogenous treatments are popular in empirical research using pooled cross-sectional or short panel datasets. This paper proposes a novel semi-parametric approach that explicitly considers 1) path dependency in the contemporaneous treatment effect and 2) a direct carryover effect from past treatments. We demonstrate that when either of these new features is present, the standard two-stage least squares estimator is generally invalid. We apply the proposed semi-parametric estimation and inference approach to revisit the seminal work of Acemoglu et al. (2016). Using industry-level data, we find that the magnitude of contemporaneous impacts of increased Chinese import competition on US manufacturing employment depends on an industry’s past import exposure. In particular, industries with larger trade shocks in the 1990s tend to experience stronger impacts from contemporaneous trade shocks in the 2000s.