Induction gets you nowhere though: where did our privileged parents get their brains from? You're proving my point here: we inherit roughly 50% of our traits through our parent's genes.

I never claimed IQ was the best measure (surprised it looked like random noise though), but certainly our cognitive traits matter. So to my question: How do you distinguish that privilege from the privilege you got from your "class"?

Edit: Sorry if I came across snarky here, I appreciate your answer!