> A person in a given place on the spectrum seems to earn the same regardless of whether or not they have a degree. Real income to GDP ratio has been stagnant

> A person in a given place on the spectrum seems to earn the same regardless of whether or not they have a degree. Real income to GDP ratio has been stagnant by some degrees but in this case, we're only looking at average IQ on a normal distribution, average as in 85-115 (or whatever the official range is), assuming that's what you mean by 'spectrum'. e.g. for the average {IQ} or whatever metric you meant in a person, he/she will earn more compared to the same person ceteris paribus, but without a university education.