Behavior: Stopping at Two

Advocates of zero population growth about four years ago began urging couples who wanted children to "stop at two." At first their campaign seemed to be having little impact. Last week, however, Government statistics showed that for the first time in U.S. history, the fertility level has dropped to 2.1 births per woman. This means that the fertility rate is down to the replacement level: if it continues at that level for a few more generations, and if emigration equals immigration, the number of births every year will just offset the number of deaths, and the U.S. population will become stabilized.

How...

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