An interesting perspective on the declining birth rate in first world countries is that organisms probably don't just optimize for number of offspring but also for their place in the food chain.
Selection bias. People being billionaires are often single mindedly interested in and busy with being billionaires.
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Not the ones around here. They have wives and children. Smallish families.
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Even on the East Coast very wealthy families are moderarate in size in my experience.
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