Top inventor inflows raise local inventors' patent output beyond firm boundaries via Marshallian knowledge spillovers, identified with Bartik instruments; state tax gaps distort the geography of inventive activity.
Two-Way Fixed Effects and Differences-in-Differences with Heterogeneous Treatment Effects: A Survey.Economet- rics Journal26(3): C1–C30
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Marshall meets Bartik: Revisiting the mysteries of the trade
Top inventor inflows raise local inventors' patent output beyond firm boundaries via Marshallian knowledge spillovers, identified with Bartik instruments; state tax gaps distort the geography of inventive activity.