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* By impeding not only trade and technological diffusion but also the depredations of slave traders, the ruggedness of certain African regions' terrain had a significant positive impact on these regions' development (with Diego Puga).<ref>{{cite journal |last=Nunn |first=N. |last2=Puga |first2=D. |year=2012 |title=Ruggedness: The Blessing of Bad Geography in Africa |journal=[[Review of Economics and Statistics]] |volume=94 |issue=1 |pages=20–36 |doi=10.1162/REST_a_00161 }}</ref>
* The introduction of the potato within the Columbian exchange may have been responsible for at least a quarter of the population and urbanisation growth observed in the Old World between 1700 and 1900 (with [[Nancy Qian]]).<ref>{{cite journal |last=Nunn |first=N. |last2=Qian |first2=N. |year=2011 |title=The Potato's Contribution to Population and Urbanization: Evidence from a Historical Experiment |journal=Quarterly Journal of Economics |volume=126 |issue=2 |pages=593–650 |doi=10.1093/qje/qjr009 }}</ref>
* In line with [[Ester Boserup|Boserup's hypothesis]], the introduction and historical use of [[plough agriculture]] appears to have given men a comparative advantage and made gender norms less equal, with historical differences in the plough use of immigrants' ancestral communities predicting their attitudes regarding [[gender equality]] (with [[Alberto Alesina]] and
* U.S. Food Aid is driven by U.S. objectives and can lead to increased conflict in recipient countries (with [[Nancy Qian]]).
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