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Spatial Diffusion of Economic Shocks in Networks

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  • Amarasinghe, Ashani
  • Hodler, Roland
  • Raschky, Paul A.
  • Zenou, Yves

Abstract

The aggregate economic impact of any developmental 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 districts.

Suggested Citation

  • Amarasinghe, Ashani & Hodler, Roland & Raschky, Paul A. & Zenou, Yves, 2018. "Spatial Diffusion of Economic Shocks in Networks," CEPR Discussion Papers 12854, C.E.P.R. Discussion Papers.
  • Handle: RePEc:cpr:ceprdp:12854
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    References listed on IDEAS

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    More about this item

    Keywords

    economic development; key player centrality; Natural resources; networks; spatial spillovers; Sub-Saharan Africa; Transportation;

    JEL classification:

    • O13 - Economic Development, Innovation, Technological Change, and Growth - - Economic Development - - - Agriculture; Natural Resources; Environment; Other Primary Products
    • O55 - Economic Development, Innovation, Technological Change, and Growth - - Economywide Country Studies - - - Africa
    • R12 - Urban, Rural, Regional, Real Estate, and Transportation Economics - - General Regional Economics - - - Size and Spatial Distributions of Regional Economic Activity; Interregional Trade (economic geography)

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