Total fertility rates in East Asia have fallen to levels without historical precedent, even though the region’s Confucian heritage long placed extraordinary emphasis on family continuity and large families. We argue that this “Confucian Fertility Paradox” dissolves once we separate two strands of the tradition and recognize that modernization affected them very differently. The pro-natal strand, built on lineage continuity, ancestor worship, and reliance on sons for old-age support, was gradually switched off as child mortality fell, incomes rose, women entered the labor force, and state pensions replaced the family as the main source of security in old age. What survived was the second strand: the veneration of education and of status won through examination success, rooted in the imperial examination tradition. Under modern conditions this surviving strand reverses sign with respect to its effect on fertility. Where the historical examination system rewarded having many sons so that one might succeed, the modern single-ranking tournament rewards concentrating resources on one or two intensively educated children, and the quantity/quality tradeoff turns a once pro-natal culture into a powerful engine of low fertility. Drawing on recent empirical evidence from China and Korea, we show how education competition becomes the channel through which traditional values now suppress childbearing. We explain why standard pro-natalist policies, such as removing birth restrictions or offering cash subsidies, accomplish little when the underlying problem is a competitive equilibrium in parental investment, and we argue that policies aimed at the source of the distortion, such as structural reform of educational pathways, hold more promise.

Here is the paper by Hanming Fang and Chang Liu.  Usually I am suspicious of such explanations, as the low birth rates typically apply also to families who do not face such education/career considerations.  Thailand?  Indians in Singapore?  Ethnic minorities in China?  But I pass this along nonetheless, due to the importance of the topic.  Via Glenn Mercer.