[safek]

The canonical reply here is that while it's true IQ tests a narrow range of abilities, (a) it's highly predictive of various facets of success in life, and (b) "specialists" are relatively rare, in that intelligence tends to be fairly well correlated across disciplines.

[banku_brougham]

(a) you are missing the point, this is as much to say that home purchasers were more likely to be wealthy in 2006. It isnt a valuation that is independent of time or context, and couldn't be a measure of human 'intelligence', whatever that means. And (b) just leads to a tautology, which again is my overall point: IQ measures things that are valuable in a specific context and time period, designed by members of the same group.