I’ve always wondered why we have two pejorative words for opposite effects: when rich people move in, it’s gentrification. When the rich leave it’s “white fligh

I’ve always wondered why we have two pejorative words for opposite effects: when rich people move in, it’s gentrification. When the rich leave it’s “white flight”. Is there some kind of equilibrium term here where a neighborhood is staying exactly the same, getting neither richer nor poorer?