Where would you rather live? In a multi-ethnic, mean IQ 130 country, or a single-ethnic mean IQ 100 country (same ethnic as you)?
There is no evidence for diminishing returns. Just something Gladwell made up. https://my.vanderbilt.edu/smpy/files/2013/02/Ferriman_20101.pdf …pic.twitter.com/O8ZWxEdnt6
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