It seems crazy to lump Mississippi and North Dakota in the same basket as NYC
Every countries has regions which are less well off. But most comparisons lump everything up. Otherwise madness ensues trying to create "proper" economic divisions...
There's a reason North Korea locks its citizens in and doesn't allow them access to any information about the outside world.
NYC itself has got to have a pretty high value given DC is 160,563.
I think its a bit problematic for a very different reason, North Dakota is mostly exporting raw materials (crops and oil) where NYC is services. I'm not sure people really get how the system fits together. To me, the friction points (borders, regulations, shipping, etc.) are the dividers. Not sure how one weighs how much those add to get regions.