There is some truth to this. Having children and raising them is an unquestionably useful activity but most societies, particularly the industrialized ones such

There is some truth to this. Having children and raising them is an unquestionably useful activity but most societies, particularly the industrialized ones such as the US, Japan, and Korea, do not 'pay' for. Many mothers are paid indirectly by their husbands (housewives), but there are many single mothers or fathers who do unpaid work as parents. Interestingly, caring for one's parents used to be an unpaid activity, and still is in non-industrialized countries. But there has been a successful transition to paid (albeit poorly) work as far as older parents are concerned, in industrialized countries such as the US and the UK (I do not think this is a popular phenomenon in Japan and Korea AFAIK).