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What is not true? He said fertility rates decrease, he didn't say fertility rates dropped below what is called 'sub replacement fertility' (which is when e.g. a man and a woman have 1 child on average, meaning every generation the population halves.)

His statement is perfectly true if say rates dropped from 5 to 4. That still causes a growing population, but the growth rates are decreasing. Once a country gets rich enough, you usually see fertility rates drop below SRF.

In fact, in Europe for example it's around 1.6, while you need roughly 2.1 or so children per woman to sustain population levels.



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