I have to admit I knew very little about Marxism going into this comment thread — this person’s comment blew my mind a little bit.
When you consider this as a background for what ‘class’ means, the whole idea of class based on income amount risks scrambling and obfuscating everybody’s relationship to the means of production in society. Marx would think that even when people make pretty different amounts of money, the pressures and stresses from society they experience are a lot more similar within each class section. For example when Donald Trump went bankrupt he had negative money, negative income, but that didn’t make him suddenly a lumpen, or a prole, there was still something categorically different about his life which income figures wouldn’t catch. I remember his daughter once saying to her that during that time he pointed to a homeless man and said ‘that man has billions of dollars more than I do’, and while that technically might be true, it’s also importantly not.