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."
Lawyers out of law schools are not qualified to practice the law. That takes an apprenticeship as an associate which is where the bottleneck is. It is a cartel, but not at the law school level.
There is a huge demand for cheap lawyers -- basically people who know rules of procedure and basic law. They don't exist, in part because law schools don't teach enough practical skills to be able to practice without malpractice.
Management is a skill. Moving up the totem pole to executive at increasingly senior levels is political games. It's a skill, but not one that contributes to economic output.
Misleading. Likely intentionally so. Top 1% mostly comes from artificially scarce markets and pyramid schemes: lawyers (with intentional bottlenecks on supply at the associate level and a pyramid scheme to make partner), doctors (with intentional barriers in both requiring unrelated undergrad study and the hazing style apprentice model), elite university professors (pyramid scheme with grad students and post docs; salaries are now typically above $200k, reaching a million), executives (pyramid scheme based on connections and kickbacks), finance, etc.
The only domain requiring unique productive skills is doctors... The rest is all market manipulation.