Our friend AVI noted the Gini coefficents in the US, by state. The Gini statistical method measures income "gaps" and is seen as a measure of economic inequality. And inequality is supposed to be bad, for no reason I can understand other than that it just sounds bad. "Gaps" sounds bad too.
It seems to me that if a state has lots of wealthy people, it's good for the state. But if a state has lots of rich people and lots of poor immigrants, it gets a bad grade. A solidly middle-class state like Utah (few very rich, few poor immigrants or "inner cities") gets a "good" grade because it is neither a magnet for immigrants nor a magnet for high-income industry.
In any event, all of the states in the US seem pretty close. The only one that bothers me is that Washington DC tops the "bad" list and it is obvious why that is. Government makes for a very wealthy industry in that factory town thanks to us taxpayers - and a large part of it is a ghetto.
Anyway, if government wants to "solve" these "gaps", the easiest way to do it is to drive the rich out of state. Problem solved, statistics fixed. New York, New Jersey, and Connecticut are trying hard to do that.
Florida, Texas, South Carolina, and Wyoming are very welcoming of prosperous people and prosperous businesses.