At least there is still likely some remaining potential for Flynn effect gains among poorer countries globally--https://ourworldindata.org/intelligence/
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Some work suggesting further progress in reducing infectious disease (also obviously nutrition) may help further--https://www.scientificamerican.com/article/why-is-average-iq-higher-in-some-places/ …
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I suspect there is likely a considerable degree of reverse causality as well, but would be surprised if it explained the entire effect.
End of conversation
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