[Séminaire CREM Caen]  Difference-in-differences with endogenous externalities: model and application

Présentation de Sandy DALL’ERBA, University of Illinois at Urbana-Champaign

[Séminaire CREM Caen]  Difference-in-differences with endogenous externalities: model and application
CREM
Lundi 26 juin 2023, 10h00
UFR SEGGAT - MRSH - Université de Caen Normandie
MRSH, Salle des Actes, et sur Zoom

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.