Publications Differentiated Products and Evasion of Import Tariffs, 2008, joint with Beata S. Javorcik. Journal of International Economics, Volume 76, Issue 2, December 2008, Pages 208-222 Services Inputs and Firm Productivity in Sub-Saharan Africa, 2008, joint with Jens M. Arnold and Aaditya Mattoo, Journal of African Economies, doi:10.1093/jae/ejm042 Work in progress Political Institutions, Voter Turnout and Policy Outcomes, 2008, joint with Eileen Fumagalli. Refugees and Illegal Arms Trade, 2008. Information and Migration: Ghanaian immigrants in Italy, 2007.