They don’t build new 1000 sq ft houses. Rent is as high as a mortgage. Kids are a luxury.
Funny that. At America's founding it took 90-95% of the population to focus on food production just to keep from starving, and they had lots of kids. Now that figure is down around 3% but people tell themselves "kids are a luxury" they can't afford. The dissidents can put that lie on your tombstone.
People can have lots of kids. It just means tradeoffs they are not willing to make.