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Along_the_Wire you don’t need 3 or 4 kids - that’s where the population problem is.
The average birth-rates in the west are already notably below replacement rate and falling…
Replacement rate in developed countries is 2.1 kids per woman - in the UK the fertility rate is currently just 1.49 kids per woman, in the EU it’s 1.46 kids per woman, in the US it’s 1.66. While over in Japan it’s 1.26, and China is way down at 1.18.