In the followup
One possible answer is that the causal pathway is high GDP → lots of education → lots of practice with abstract reasoning → high abstract/symbolic IQ. I don’t think this can be the whole story, because some countries that “cheated” to get high GDP (eg oil sheikhdoms) can’t translate it into IQ points at the same rate as everyone else. I’m stuck with the boring basic explanation that maybe you need to do a lot of abstract reasoning tasks to get high GDP.
You can't possibly be this dumb. Tfw you're so blinded by racism you transfer yourself to the platonic realm where numbers are things in themselves.