Commonly cited https://web.archive.org/web/20130112013556/http://prometheussociety.org/cms/articles/the-outsiders … but noted self-selection into these societies, and not necessary effect of IQ itself, but of others.
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i.e. social problems due to misfit with others cannot find peers. If all society was higher, would not be a problem.
Only real negative causal relation I know is myopia. Correlates about .20 with IQ, higher in Asians, lower in Africans etc.
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