There tends to be a correlation within smaller areas... everything is relative.
Someone in NJ can do the same job and get more money for it than someone in KY but be poorer.
Very good point. The NE is ridiculously expensive. Housing prices and rent are absurdly high. Taxes kill the NE because we make more money but a lot of things cost so much more. In the neigbor hood I grew up in a bungelow- a beach house that people only used to live in during summer, cannot be had for under $300,000. The average house in Nassau County is now over 400,000. People may make more money but that doesn't necessarily mean they are doinig better. It is all relative.