Garg A, Morduch J
J Popul Econ. 1998;11(4):471-93. doi: 10.1007/s001480050080.
"When capital and labor markets are imperfect, choice sets narrow, and parents must choose how to ration available funds and time between their children. One consequence is that children become rivals for household resources. In economies with pro-male bias, such rivalries can yield gains to having relatively more sisters than brothers. Using a rich household survey from Ghana [the 1988-1989 Ghana Living Standards Survey], we find that on average if children had all sisters (and no brothers) they would do roughly 25-40% better on measured health indicators than if they had all brothers (and no sisters)."
当资本市场和劳动力市场不完善时,选择集就会缩小,父母必须决定如何在子女之间分配现有的资金和时间。结果之一是,子女会成为家庭资源的竞争对手。在存在重男轻女偏见的经济体中,这种竞争可能会使姐妹相对多于兄弟的家庭获得好处。利用来自加纳的一项丰富的家庭调查(1988 - 1989年加纳生活水平调查),我们发现,平均而言,如果孩子全是姐妹(没有兄弟),那么在衡量健康的指标上,他们的表现要比全是兄弟(没有姐妹)的孩子大约好25% - 40%。