Memes

It's better to think of working, middle, and upper class in terms of how much of their income derives from labour vs capital.

Working class = majority of income from working.

Upper class = majority of income from owning capital, i.e. can afford not to work at all.

Middle = somewhat evenly split.

Traditionally working class was associated with "lower" jobs such as labourers, and those working cushy office jobs usually earnt a high enough income to accumulate enough capital to become middle or upper class.

This is more aligned with the British definition, where their "middle class" is more equivalent to the US "upper middle class." Make no mistake though, with many jobs not paying enough to accumulate capital, professionals such as teachers, accountants, and nurses would firmly be considered working class, because they you know, need to work.