Tldr: "Almost all of the growth in top American earners has come from just three economic sectors: professional services, finance and insurance, and health care, groups that tend to benefit from regulatory barriers that shelter them from competition.
The groups that have contributed the most people to the 1 percent since 1980 are: physicians; executives, managers, sales supervisors, and analysts working in the financial sectors; and professional and legal service industry executives, managers, lawyers, consultants and sales representatives."
Here is a reference chain:
https://www.nytimes.com/2017/11/17/upshot/income-inequality-...
Tldr: "Almost all of the growth in top American earners has come from just three economic sectors: professional services, finance and insurance, and health care, groups that tend to benefit from regulatory barriers that shelter them from competition.
The groups that have contributed the most people to the 1 percent since 1980 are: physicians; executives, managers, sales supervisors, and analysts working in the financial sectors; and professional and legal service industry executives, managers, lawyers, consultants and sales representatives."