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The scatter plots show a correlations strong enough that they startled me when I saw them. The higher the IQ, the lower the correlation though.

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Yeah, I saw those plots. I didn't personally find them startling, though. To me, they show a weak correlation (that is stronger as you go lower in income, as you note).

That's an incredibly strong correlation by social science standards (seriously, one number correlates that well with something as complicated and path-dependent as income?), which is also weak enough to be completely useless for an individual trying to make decisions. There is no contradiction, because social science is incredibly hard.

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