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Could be. Richer regions would have better health care, emergency services, sanitation, etc

beyond basic healthcare, better healthcare has surprisingly low effect on life spans.

do you have a citation? This seems like an incredible result, and I would love to hear more!

I've seen it established too, though I don't have the citation either.

But doesn't seem too "incredible", it's mostly the typical notion of "diminishing returns" we see everywhere.