Actually RU, that’s a good approximation for many/most professions, but not all that good an approximation. http://www.vanderbilt.edu/Peabody/SMPY/DoingPsychScience2006.pdf
gives more detail, showing a significant marginal impact from, at the least, 99.99th percentile math achievement at age 12 relative to merely 99.8th percentile math achievement at age 12.
Actually RU, that’s a good approximation for many/most professions, but not all that good an approximation.
http://www.vanderbilt.edu/Peabody/SMPY/DoingPsychScience2006.pdf
gives more detail, showing a significant marginal impact from, at the least, 99.99th percentile math achievement at age 12 relative to merely 99.8th percentile math achievement at age 12.