When NRR = 1.0, each generation of 1000 baby girls grows up and gives birth to exactly 1000 girls. In countries with high mortality, NRR can be as low as 70% of GRR. NRR is always lower than GRR, but in countries where mortality is very low, almost all the baby girls grow up to be potential mothers, and the NRR is practically the same as GRR.
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