There are a lot of highly intelligent people at all levels of income distribution, so while there might be a polarization effect, it's not to the point of being

There are a lot of highly intelligent people at all levels of income distribution, so while there might be a polarization effect, it's not to the point of being segregation. Intelligence can help you gain wealth, but if you're never given an opportunity or don't have a lot of drive you'll struggle perpetually.