[chosenbreed37]

I agree with you reasoning. I think in the UK the term "working class" tends to mean something different from what you're describing generally speaking. By your reasoning I'd say well over 95% of the population would be working class. However if ask people on the street many would say they're middle-class. Some might even admit to being upper middle class but the vast majority of them still have get out of bed Monday to Friday and do something that earns money.

[alasdair_]

Exactly. "Working class" means, typically, that they are from a family of blue-collar workers.

"middle class" is essentially white collar

"upper class" really means the aristocracy/ long-term establishment. Even a CEO making millions a year would be called "upper middle class" unless they came from an old established family.