What are the policy implications of believing in IQ? I can't think of any. The issue seems to exist only so people can argue. I agree with TC, I think his point is natives don't have practice at IQ questions so they won't do well on IQ tests, not that being able to fish makes you smart. I'd suggest that a random native New Guinean baby raised in the US would have an average 100 IQ but I'm not a IQ stats fan so I'd better not.

IQ may correlate with success but I know a lot of high IQ math nerds who still live in their parents' basements and a lot of hard working sub-120 IQ people who are doctors.