It's not about dollars. It's about your behaviors. Behaviors of the middle class. Middle class people typically do things like own one home, work two jobs, save for their kids' college, keep their cars for a while, etc.
I wouldn't consider working two jobs to be middle class unless you meant two people in the household working one job each, unless there are a lot of people working two jobs to maintain a middle class lifestyle.
The whole lower vs middle vs upper class split is mostly a fraud. People I've had discussions with about their class in that respect are usually trying hard to make an already meaningless definition make them look great. People who work jobs like mine are always "upper middle class" in their mind.
I wanted to back you up in that you are right that it's behavior that defines classes. But it's more the part that matters, your means of producing wealth. If your money works for you or employs others to work for you, you're investment class or capitalist class. Punching a clock, or picking up a salary check means you're working class. The third class are those who slip below maintaining employment, I call them "capitalism's reserve army" but there's probably a better term for the unemployed.
These little ego boosting distinctions people come up with "upper working class" are meaningless.
Middle class isn't working two jobs. If anything, it is a couple working one job and the partner doing their own thing: raising kids, personal project, community work.
No its social status you can be a poorly paid academic/scientist and are middle class but say a train driver on 80k a year will consider themselves working class
