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One thing I genuinely wonder about re: current and future birthrates is if the selection pressures stay relatively consistent. People always talk about the current bottleneck selecting for people who still choose to reproduce under modernity but do those selection pressures change too quickly to effectively select for anything? Things have changed so radically culturally and technologically just in my short lifetime. Are current births selecting for the same type of personalities as in the 2000s? What about now vs the 2030s and 40s? Maybe the type of personality that become DINKs in the 2020s would’ve had four kids in 1990 or will in 2040. For example right now (in the US at least) actually practicing a religion makes one much more likely to reproduce but could that reverse?

I genuinely don’t know. It makes it even harder to make any serious predictions

or example right now (in the US at least) actually practicing a religion makes one much more likely to reproduce but could that reverse?

Why? All established religions stress family life and promote having children. At least the Abrahamic ones, I've no idea about buddhism as actually practiced.

Notoriously, the ones that didn't- Quakers who made marriage difficult and saw sex as sinful, Shakers who abstained from sex and procreation etc are all gone.

I've no idea about buddhism as actually practiced.

Lyman Stone seems to think that non-Abrahamic religions don’t bring any fertility premium.