I am currently writing the third chapter on fertility for my book on demographics—see here— which focuses on on the onset of sub-replacement fertility in one country after the other since the 1970s, what's driving this shift, and whether the decline—to a large extent driven by birth postponement or so-called tempo effects—is reversing or accelerating. It is a treatise on the notion of a second demographic transition, including empirical case studies, and a discussion about whether sub-replacement fertility is something to worry about, cherish, or perhaps to approach with indifference. This is an enquiry that is defined just as much by what it excludes as what it includes. Once we dip into the multidisciplinary academic work on demographics which has emerged in the last two-to-three decades, we go from a large literature to an almost unmanageable one. I will hopefully be able to present a first draft on the chapter soon. In the mean time, however, one thing that as struck me during my recent work is that global fertility will soon fall below the replacement level, defined as just over two children per women, despite what the latest UN projections would have you believe.
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