One child per couple means every generation will be half as big as the generation before it. That is such a ridiculously fast decrease that it is no surprise th

One child per couple means every generation will be half as big as the generation before it. That is such a ridiculously fast decrease that it is no surprise that population aging will be an enormous problem. Having 2 (or 2.1 or something like that) children per couple will also result in a shrinking population, but at a much more sustainable pace. Not that I particularly support such a policy. It appears that a country becoming richer and more educated automatically reduces population growth, to the point where the classic Western countries tend to have mostly stable populations. I don't see multi-partner families being a significant part of the solution for large population numbers.