[nonameiguess]

I'm going to take a different path from the other responses so far. The claim that IQ predicts job success seems to be contentious among a lot of people, but as far as I can tell, it is fairly well supported and other ways of evaluating candidates are at least as noisy anyway, short of professions with the sort of concrete standards that allow for meaningful licensing or something like being a military officer where they're going to train you and evaluate your performance in context for 4 years before ever giving you a real job anyway.

However, thanks to the way mental traits get distributed, a fairly small proportion of the population is ever going to have a high IQ. Roughly 16% of the population at any one time will have greater than 1 SD north of median. Less than 3% will be greater than 2 SD.

More people than that need to have jobs. If you're going to insist only 97th percentile people can work for you, you need to be offering 97th percentile salary. Currently, that is around $220,000 a year in the US. "Most" jobs can definitely not offer that.

[oreally]

> fairly well supported and other ways of evaluating candidates are at least as noisy anyway

It's on you to back up this claim. And the reason had better not be 'oh a bunch of tech companies do it' when there are entire fields from psychology that do research on this exact question, and they consider things like personalities, etc.

You also might be confusing higher-iq job scopes for job success.