Fifty out of 50: That’s where the Charlotte area ranked in Harvard economist Raj Chetty’s influential 2014 study of economic mobility. By now, that headline finding is well-known. It’s spawned task forces and soul-searching in Charlotte for half a decade, as leaders seek a way to change the city’s dynamic and increase upward mobility. So, it’s hard to move from the bottom to the top. But what about other, less dramatic moves that can still vastly improve a person’s circumstances - say, from the lowest one-fifth of the ladder to the middle fifth?