Fertility and polygyny: Experimental evidence from Burkina Faso
通过布基纳法索的实地实验发现，一夫多妻制家庭中，妻子间的竞争会改变避孕决策，丈夫参与反而增加避孕使用，与一夫一妻制家庭相反。
Decision-making about fertility differs between monogamous and polygynous households. In an experiment in Burkina Faso that gives women access to free contraceptives, either alone or with their husband, involving the husband decreases contraceptive use among monogamous women, but not among polygynous women. Where there is co-wife rivalry, it increases contraceptive use. This is consistent with a model where monogamous women have a stronger preference for contraceptives than their husband, while this preference difference is smaller or even reversed among polygynous households due to co-wife competition around fertility.