Interesting. I don't have access to the full paper, but it appears that the individuals in that study were 28 when the research was conducted. I'll definitely be searching for recent studies conducted on the same cohort when I get the chance, but I do wonder if that correlation holds steady-ish over time, and also if it will be replicated with cohorts of a later generation as other economic climates develop.
> each point increase in IQ test scores raises income by between $234 and $616 per year after holding a variety of factors constant
From: https://www.sciencedirect.com/science/article/pii/S016028960...