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Updated: May 7, 2025


Of course in actual life the two-child and the five-child groups will intermarry. And even if each marries its own kind, the number of children will fluctuate. Nevertheless, there is plenty of evidence of three great tendencies. First, certain kinds of families tend to be small or large as the case may be. Second, each kind tends to marry into its own kind more often than into the other.

If we make no allowance for the fact that more boys than girls are born, there would be 136 parents in the two-child group a century hence, and they would have 136 children. On the other hand, there would be 8744 parents and 21,860 children in the five-child group. Over a hundred and sixty times as many! Now that we have done the arithmetic, what does it mean?

The teachings of asceticism which had such power among Christians until the sixteenth century are again heard under a different guise in at least one of the modern cults most successful in the United States. Neo-Malthusianism is found exemplified in the two-child families of the nobles of France and Germany and the rich of New England.

In both sets 15 percent of the children die before reaching the age of marriage, and 10 percent of those who grow up fail to marry. These are normal percentages. Among those who marry, however, 20 percent of the two-child group, and only 10 percent of the other set, fail to have children. How many parents will there be in each group at the end of three generations?

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