This isn’t particularly helpful, though, as it doesn’t explain why these classes exist. Class traditionally refers to how we engage with societal production and distribution, like wage laborers, business owners, sole proprietors, artisans, etc. By focusing on the outcomes of this class distinctions, you obscure the mechanisms by which they persist and are reinforced.
So I learned it this way:
Upper Class - can live a luxurious life without working at all, and even have domestic employees etc.
Middle Class - can live comfortably but only if they work
Lower class - cannot live comfortably even if they work, and can very easily end up homeless (no social safety net)
The dude who taught me this was my Sociology of Work teacher over twenty years ago.
This isn’t particularly helpful, though, as it doesn’t explain why these classes exist. Class traditionally refers to how we engage with societal production and distribution, like wage laborers, business owners, sole proprietors, artisans, etc. By focusing on the outcomes of this class distinctions, you obscure the mechanisms by which they persist and are reinforced.