Discussion
The Net Reproduction Rate (NRR) = 1 implies exact replacement, then what NRR \(\lt\) 1 implies ?
Answer: D
If the net reproduction rate is less than one, the population is not replacing itself and, in the long run, its growth rate will be negative. Each generation is smaller than the one before, so numbers eventually fall.
In the short run the population can still grow, because momentum from a young age structure keeps births above deaths for some time, so a positive growth in the short run is possible, but the question asks what the condition implies in the long run. The options with a positive growth rate in the long run are wrong, and the short-run negative growth is not implied.
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