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How does the average loss of 4 IQ points exactly translate into the declining number of 120+ IQ individuals? Could you estimate the effects on GDP and HDI, and should we really worry given the likely progress in embryo selection and brain upgrading tech?
I assume that the high-IQ groups (coastal whites, Jews, Asians) pair bond mostly within these groups, so there's little "IQ dilution". On the other hand, high IQ men may be the first to gain a better understanding of risks related to modern dating and marriage, deciding to remain childless and disconnect from the society.