Jacoby, H. G. (1995). The economics of polygyny in Sub-Saharan Africa: Female productivity and the demand for wives in Côte d'Ivoire. Journal of Political Economy, 938-971.
2. A reduction in the number of children born to a couple can increase the representation of their children in the next generation if this enables the couple to invest sufficiently more in the education, training, and "attractiveness" of each child to increase markedly their probability of survival to reproductive ages and the reproduction of each survivor.
Becker, Gary Stanley, and Gary S. Becker. A Treatise on the Family. Harvard university press, 2009.
3. This is consistent with previous literature, which suggests that wives may serve as an alternate form of capital accumulation.
Akresh, Richard, Joyce J. Chen, and Charity Moore. "Altruism, Cooperation and Intrahousehold Allocation: Agricultural Production in Polygynous Households." UW Madison AAE department seminar. 2011.
Don't quote economics papers to win friends.