In my mind middle class jobs are doctor, lawyer, professor, politician. Highly relative. By default these are considered upper middle class, although in certai

In my mind middle class jobs are doctor, lawyer, professor, politician. Highly relative. By default these are considered upper middle class, although in certain cases they can be either middle class or upper class. Remember, middle class isn't a solidly defined term. It has nuances and ranges. Anyway, concerning the article: tl;dr Wages are low because labor unions aren't influential enough.