A total fertility rate of approximately 1.0 will cause each generation to be half as large as the preceding generation.

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A total fertility rate (TFR) of 1.0 means that, on average, each woman is giving birth to 1 child over her lifetime. Since it takes two people (a man and a woman) to produce a child, a TFR of 1.0 would result in each generation being half the size of the previous one, assuming no immigration and that the TFR applies uniformly across the population.

A Total Fertility Rate of Approximately 1