A demographic inverse pyramid occurs when parents decide to breed below replacement rate. I intend to have two or more children, preferably around four children, as a way of ensuring that my values exist more strongly over the coming decades. It's a form of game theoretic cooperation with my culture in what resembles a Commons problem.

It happened that many people were born and raised, setting all-time population records, and trying to keep this number increase forever and forever is unviable. One may argue that there's still a lot of land for people to live in, but truth is people skip villages and small towns for capitals because they're not needed where they used to live. There's land, but there's no demand.