Dynamic Difference-in-Differences with Interference

Ruonan Xu

AEA Papers and Proceedings, 2026, vol. 116, 58-63

Abstract: Interference/spillover is a common concern in place-based policy evaluation. This paper develops a difference-in-differences framework that accounts for interference using panel data with multiple posttreatment periods and potentially staggered treatment adoption. I define causal parameters under interference, establish identification under a modified parallel trends assumption, and propose doubly robust estimators with valid inference. The method is illustrated through an empirical application.

JEL-codes: C21 C23 O13 O18 Q23 Q57 (search for similar items in EconPapers)
Date: 2026
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DOI: 10.1257/pandp.20261108

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