Almost all professional and semi-professional salaries are becoming bimodal. I'm too tired at the moment to look this up, but the NY Times had a piece sometime

Almost all professional and semi-professional salaries are becoming bimodal. I'm too tired at the moment to look this up, but the NY Times had a piece sometime in the last couple of years where they were discussing income distributions, and had an interactive, and what they looked like, almost across the board, was a bigger lower mode, and then a second, smaller, more spiked mode much higher. What struck me about that piece was that it was framed in terms of skewed incomes, but the bimodality of it didn't get discussed much at all, nor the fact it was so widespread across different disciplines. To me it was very disturbing, because it suggested that there was a growth, across disciplines, of two "classes", one established, with a relatively large income, and another, larger class, with a much smaller income. I was very curious about this, and have wondered what the groups are--if it's because of older, senior individuals and younger, junior individuals. Maybe the latter are trainees? Maybe the latter came into the labor market at a less favorable time? Maybe there's just a kind of winner-takes-all sort of phenomenon? It was really disturbing to me, and seems difficult to explain in terms of any specific features of any field, because it was so, so widespread across labor areas. It was partially disturbing that it was sitting right here in these graphs at a major news outlet about income distributions, and was not being acknowledged even then. It was probably more disturbing to me than the general long-tailed skewed income distribution that gets discussed, because it suggested (at least to me) very unnatural about how incomes were being allocated, even more so than the stereotypical long-tailed but unimodal curve.