The wealthy demographics aren't having kids either, and the decline correlates with each inflection point in the rise of pleasure and mental stimulation technology.

Sub-Saharan birthrates are starting to decline just as they're gaining access to smartphones.

All of the countries where women have fewer rights are also experiencing decline in birthrates. They have ~10-30% smartphone penetration.

"Having a child seems fun" is dopamine opportunity cost as much as a financial one. People have always been poorer, but they've never been so endlessly stimulated.

> I'm not in a position to have children because I can't afford them, so I won't. Now I have more time to fill, what's on TV?

Replace this with, "I'm bored. What's on TV / YouTube?" Everything else is unnecessary complication.