“Tales of Migration without Wage Differentials: Individual, Family, and Community Contexts,” Institutions and Economic Development, Vol. 1, 2003.
“Cooperation and Wealth,” Journal of Economic Behavior and Organization, Vol. 53, 2004.
"Rethinking the Brain Drain," World Development, Vol. 32, 2004.
“On the Evolutionary Edge of Altruism: A Game-Theoretic Proof of Hamilton’s Rule for a Simple Case of Siblings,” (with You Qiang Wang), Journal of Evolutionary Economics, Vol. 14, 2004. (Reprinted in Bina Agarwal and Alessandro Vercelli (eds.), Psychology, Rationality and Economic Behaviour: Challenging Standard Assumptions. London: Macmillan, 2005.)
“On the Economics of Refugee Flows,” Review of Development Economics, Vol. 8, 2004.