Well of course it is getting more skewed. A lot of industries have not actually become more productive. Industries where making the first copy is very difficult

Well of course it is getting more skewed. A lot of industries have not actually become more productive. Industries where making the first copy is very difficult, and subsequent copies are basically free, be it software, books, movies, TV. Economies of scale, opening to new markets means those returns are higher than ever. Compare that to a janitor pushing a broom. How has he become more efficient in the last 50 years. And a lot of industries seem to have had negative productivity growth, the ratio of administrators to professors in college is going in the wrong direction