Estimating the spillover economic effects of foreign conflict shocks: Evidence from Boko Haram

What are the spillover effects of foreign conflicts on regional economies, and what local factors can help mitigate the impact of such economic shocks? Adopting a difference-in-difference framework leveraging the breakout of the Boko Haram insurgency in Northeastern Nigeria in 2009, we study its effects in neighboring areas in Cameroon, Chad and Niger that were not directly targeted by Boko Haram activities until the mid 2010s. We find strong negative effects on regional economic activities – proxied by reductions in nighttime lights – particularly amongst areas within 200 km from the Boko Haram area. This negative impact is concentrated in urban areas, as trade was impacted and economic uncertainty rose. The rise of Boko Haram also resulted in more agricultural burning. Foreign conflict shocks can thus accentuate pressure on domestic resources. Focusing on the heterogeneity of the impacts, we find smaller resilience effects in those areas with a worse geography, less agricultural development, more limited infrastructure, and weaker markets and institutions. Overall, these findings suggest that conflicts may have larger spillover effects in geographically challenging and/or economically poorer regions, as is the case in various regions of Africa.