Over the last one hundred years, there has been, in many developed countries, a demographic convergence towards the two child family. The possible implications for population growth of such a tendency are considered in this paper in terms of both family limitation and also the intergenerational transmission of fertility. These two effects interact so that as the proportion of two-child families increases, the possible influence of mother-daughter fertility associations on population growth decreases, though even now it could override otherwise significant changes in either or both of the birth and death intensities. In particular, it is shown that according as to how fertility is transmitted through generations, it is still possible to have zero growth rates consistently with a widely dispersed stable distribution of family size as well as a typical mortality regime.

中文翻译：

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生育力可遗传时完成胎次的分布

在过去的一百年里，在许多发达国家，人口趋于两孩家庭。本文从家庭限制和生育率的代际传递两个方面考虑了这种趋势对人口增长的可能影响。这两种效应相互作用，因此随着二孩家庭比例的增加，母女生育关联对人口增长的可能影响降低，尽管即使现在它也可能覆盖出生和死亡强度中的一个或两个的显着变化。特别是，根据生育力如何代代相传，