Differential Fertility and the Distribution of Traits: The Case of IQ

@article{Preston1993DifferentialFA,
  title={Differential Fertility and the Distribution of Traits: The Case of IQ},
  author={Samuel H. Preston and Cameron Dougall Campbell},
  journal={American Journal of Sociology},
  year={1993},
  volume={98},
  pages={997 - 1019}
}
A recurrent fear during the past century is that the mean IQ level of populations will decline because persons with lower IQ scores have above-average fertility. Most microlevel data demonstrate such fertility differentials, but population IQ levels have risen rather than fallen. In this article, a simple two-sex model shows that negative fertility differentials are consistent with falling, rising, or constant IQ distributions. Under a wide variety of conditions, a constant pattern of fertility… 
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