Wolfgang Lutz and the Low Fertility Trap

Back in July I published a post about Austrian demographer Wolfgang Lutz’s hypothesis that those countries which sustain total fertility rates below 1.5 for any length of time may have fallen into a self-reinforcing low-fertility trap. Old Rottenhat (Ray to his friends) argued in comments that I had explained the reasons for the existence of low fertility but that I had not justified the idea that this was a ‘trap’. Old Rottenhat was right, and taking advantage of the fact that Lutz himself has now given a fuller outline of the hypothesis at the recent Postponement of Childbearing in Europe Conference (see presentation) I will now try and remedy this lacuna.

So here finally Ray, is your reply: I hope it is something which indeed goes beyond the obvious.
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