There are some positions that you don't want low IQ (low intelligence) people doing them. If a group of 'X' people (based on any factor you like, be it race, g

There are some positions that you don't want low IQ (low intelligence) people doing them. If a group of 'X' people (based on any factor you like, be it race, gender, ideology, protected characteristics, etc) are statistically lower IQ, you would expect this to be reflected in selection over a large enough sample. Equally, I would expect that when you're fighting for people who are in high demand, that the wage reflects it. Merit is a "positive discrimination" for people who do the job better.