A Causal Framework for Evaluating Drivers of Policy Effect Heterogeneity Using Difference-in-Differences
用双重差分评估政策效应异质性驱动因素的因果框架AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要以双重差分研究因果效应异质性,并明确将邻里动态和跨境购物纳入政策驱动因素分析。
用双重差分评估政策效应异质性驱动因素的因果框架AI 解读 ↓
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Policymakers and researchers often seek to understand how a policy differentially affects a population and the pathways driving this heterogeneity. For example, when studying an excise tax on sweetened beverages, researchers might assess the roles of cross-border shopping, economic competition, and store-level price changes on beverage sales trends. However, traditional policy evaluation tools, like the difference-in-differences (DiD) approach, primarily target average effects of the observed intervention rather than the underlying drivers of effect heterogeneity. Common approaches to evaluate sources of heterogeneity often lack a causal framework, making it difficult to determine whether observed outcome differences are truly driven by the proposed source of heterogeneity or by other confounding factors. In this paper, we present a framework for evaluating such policy drivers by representing questions of effect heterogeneity under hypothetical interventions and use it to evaluate drivers of the Philadelphia sweetened beverage tax policy effects. Building on recent advancements in estimating causal effect curves under DiD designs, we provide tools to assess policy effect heterogeneity while addressing practical challenges including confounding and neighborhood dynamics.