Excellent reply, but all of this blather about inequality makes it seem as though this stuff just happens to otherwise comparable people. From where I sit too much of the inequality is a consequence of other largely government policies, rather than something that just occurs randomly.
Most of us received a public education and sadly much of that education is substandard. Generally, the better the education the better the income. There is far less income inequality amongst university graduations than there is with the population as a whole. The political response to this has been college loans and, of late, a push to make junior colleges free to all high school graduates.
None of improves undergraduate education, but it plays well politically. Income redistribution through taxes may reduce statistical differences but, again, there is no improvement in the skills of low wage earners.
Until we desire to tackle the cultural differences that impede many students, and until we make education competitive (competition is the largest single driver of product improvement) we are stuck with what we have.
I’m more interested in improving lives than in magically massaging macro numbers to reduce inequality. So should we all.