International Comovement in the Global Production Network
70 Pages Posted: 26 Jun 2019 Last revised: 26 Jun 2021
Date Written: June 2019
This paper provides a general and unified framework to study the role of production networks in international GDP comovement. We first derive an additive decomposition of bilateral GDP comovement into components capturing shock transmission and shock correlation. We quantify this decomposition in a parsimonious multi-country, multi-sector network propagation model featuring a single composite supply shock, with data for 29 countries and up to 30 years. We find that while the network transmission of shocks is quantitatively important, it accounts for a minority of observed comovement under a range of standard values of structural elasticities. To assess the role of delayed propagation and intertemporal shocks– features absent in the standard static framework– we extend both the accounting decomposition and the model to a dynamic setting and enrich the space of shocks. Quantitatively, delayed propagation contributes relatively little to the overall GDP comovement compared to the impact effects captured by the static production network model. Models featuring two intratemporal shocks (TFP and labor supply) strike a good balance between parsimony and fit to the data.
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