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* Current differences in trust levels within Africa are attributable to the impact of the Atlantic and Arab slave trades, which have caused the emergence of low-trust cultural norms, beliefs, and values in ethnic groups heavily affected by slavery (with [[Leonard Wantchekon]]).<ref>{{cite journal |last=Nunn |first=N. |last2=Wantchekon |first2=L. |year=2011 |title=The Slave Trade and the Origins of Mistrust in Africa |journal=[[American Economic Review]] |volume=101 |issue=7 |pages=3221–3252 |doi=10.1257/aer.101.7.3221 |url=https://dash.harvard.edu/bitstream/1/11986331/1/nunn-slave-trade.pdf }}</ref>
* 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 |url=http://nrs.harvard.edu/urn-3:HUL.InstRepos:29412035 }}</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 |pmid=22073408 |doi-access=free }}</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 Paolo Giuliano).<ref>{{cite journal |last=Alesina |first=A. |last2=Giuliano |first2=P. |last3=Nunn |first3=N. |year=2013 |title=On the Origins of Gender Roles: Women and the Plough |journal=Quarterly Journal of Economics |volume=128 |issue=2 |pages=469–530 |doi=10.1093/qje/qjt005 |hdl=10419/51568 |hdl-access=free }}</ref>
* 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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