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View submission: Ask Anything Wednesday - Economics, Political Science, Linguistics, Anthropology
IQ, measured appropriately, can be used to predict school performance, workplace performance, socioeconomic status, rates of criminality, addiction, health and mortality. None of these are perfect correlations rather we think of them as being 'influenced' by intelligence among other factors.
There's some reason to think IQ is itself made up of a few types of general cognitive sub-skills; this is reflected in the fact that most measures of intelligence are made up of several different sub-tests measuring verbal abilities, problem solving, spatial reasoning, processing speed, attention, among other things.
Whether you think any of these abilities or life outcomes add up to 'intelligence' is up to you. Maybe it's just some mysterious set of 'things' that don't look like what you think intelligence is. I think sometimes we get hung up on that point - even if you argue that IQ is not intelligence, it's still a "thing" that predicts achievement in other spheres of life, which is why there's so much attention paid to it by researchers.
There's nothing here!