(with Hodler, R., Raschky, P.A., and Zenou, Y. )
The aggregate economic impact of any project depends on its effects within the
chosen administrative region as well as its economic spillovers into other regions.
However, little is known about how these spillovers propagate through geographic,
ethnic and road networks. In this paper, we analyze both theoretically and empirically the role of these networks in the spatial diffusion of local economic shocks. We
develop a network model that shows how a district’s level of prosperity is related to
its position in the network. The network model’s first-order conditions are used to
derive an econometric model of spatial spillovers that we estimate using a panel of
5,944 districts from 53 African countries over the period 1997–2013. To identify the
causal effect of spatial diffusion, we exploit cross-sectional variation in the location
of mineral mines and exogenous time variation in world mineral prices. Our results
show that road and ethnic connectivity are particularly important factors for diffusing economic spillovers over longer distances. We then use the estimated parameters
from the econometric model to calculate the key player centralities, which determine which districts are key in propagating local economic shocks across Africa. We
further show how counterfactual exercises based on these estimates and the underlying network structure can inform us about the potential gains from policies that
increase economic activity in specific districts or improve road connectivity between
Keywords: Economic development, networks, spatial spillovers, key player centrality, natural resources, transportation, Africa.