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Correlation between IQ and GDP per capita is only 0.60, but correlation between IQ and skin color is much higher - 0.92.
https://s18.postimg.cc/9zjgon21j/IQ_...tated_2018.png
It makes you wonder whether it is possible that the same genetic mutations which make skin lighter also increase IQ?:
https://en.wikipedia.org/wiki/Pleiotropy
"Pleiotropy (from Greek πλείων pleion, "more", and τρόπος tropos, "way") occurs when one gene influences two or more seemingly unrelated phenotypic traits. Therefore, a mutation in a pleiotropic gene may have an effect on several traits simultaneously due to the gene coding for a product used by a myriad of cells or different targets that have the same signaling function. (...)"
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