"The rest" is still quite wealthy, even by today's developed economy standards. Median household disposable income is higher in Mississippi, a state widely panned for its poverty, than Germany, the richest major EU nation.
In American discourse, there's a ton of talk about inequality from the haves against the have-mores, pushing policy that often times will lead to worse outcomes for the have-nots.
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median household income is not higher in missisippi vs germany, especially not true if you adjust for the value of healthcare, education, and social benefits including time off work.