It's a necessary modifier, it's half of the women capable of breeding, not half of the women in total.
Originally Posted by Drunk Vegan
And I'd be nasty and say that it's still true for societies with easy access to contraception, as that simply reduces the number of women who can get pregnant. Societies with easy access to voluntary abortion changed the ration of pregnancies carried to full term instead so that would muddy statistics a bit.
Reductionist and proud of it.
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