While reading some financial/economic analysis, I came across a similar question and an answer:"Why do professional athletes, movie actors, and even some 23-year-old computer programmers earn so much more than teachers, nurses, and factory-line workers? The answer is simple. They’ve found a way to spread the impact of their efforts over a very large number of individuals, while the teachers, nurses, and factory-line workers can apply their efforts to a dramatically smaller number of “units,” be they students, patients, or boxes of Corn Flakes. For massive too-big-to-fail banks, the units are dollars. The downside is that as certain winners are able to spread their efforts over an enormous number of people, the required number of winners declines – ask anyone who has ever tried to become a movie actor or a pro-basketball player. International trade and internet communications, among other developments, have significantly increased that tendency toward winner-take-all outcomes. When that effect is expanded through international trade, the result is that yes, each country benefits in aggregate, but you also observe a “hollowing out” of the middle class, particularly for families that don’t have labor or capital that shares in the distribution."