[ProAm]

"Working class' is generally identified as a 'trade' job in terms of ATC it was a trade job back then because it did not require much to get the job in terms of experience or education, you were trained to do the specific job and it rarely changed over the course of your career.

[nickelcitymario]

I always thought "working class" means you make your living via your labour, regardless of what that labour is.

The difference would be people who make their living by owning things (stock, companies, property) that pay dividends. This is not to say that they don't work hard, but that their income isn't directly tied to their labour.

In this sense, someone can be both lower class (poor) and a part of the owner class. Someone else can be upper class (rich) and working class.