Instrumental Variable Network Difference-in-Differences (IV-NDID) estimator: model and application

Sandy Dall'erba (), André Chagas, William Ridley, Yilan Xu () and Lilin Yuan ()

No 2021_17, Working Papers, Department of Economics from University of São Paulo (FEA-USP)

Abstract: The difference-in-difference (DID) framework is now a well-accepted method in quasi-experimental research. However, DID does not consider treatment-induced changes to a network linking treated and control units. Our instrumental variable network DID methodology controls first for the endogeneity of the network to the treatment and, second, for the direct and indirect role of the treatment on any network member. Monte Carlo simulations and an estimation of the drought impact on global wheat trade and production demonstrate the performance of our new estimator. Results show that DID disregarding the network and its changes leads to significant underestimates of overall treatment effects.

Keywords: International Trade; Climate Change; Crop Yield (search for similar items in EconPapers)
JEL-codes: C21 F14 Q54 (search for similar items in EconPapers)
Date: 2021-06-21
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Working Paper: Instrumental Variable Network Difference-in-Differences (IV-NDID) Estimator: Model and Application (2021)
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