It’s true not just economics anything that impedes our ability to empathize with one another will create the possibility of this. Though I think for demogogues economic stress it’s the easiest to exploit and misdirect to protect from “levelling”. Also geographic segregation makes it much easier to “otherise” people etc etc regardless. Look at the Brits and the Irish and they are all pale af but Brits wanted the land so they created a construct to legitimize it.