US map of effective states based on US Dollar movement

http://www.fastcoexist.com/1681677/a-new-map-of-the-us-created-by-how-our-dollar-bills-move#1

Theoretical physicist Dirk Brockmann used the dollar bill tracking site Where’s George to see how money moves, and create new state boundaries based on our economies. The darker the blue lines, the less likely it is a dollar bill will have crossed it.