Posted 28 April 2012 - 10:50 AM
^ I don't think it's necessarily illogical given the fact that MSAs and CSAs are county-based agglomerations, which, while not perfect, is pretty convenient. When you look at things on a county level, you can see why the split occurred. Before the establishment/take off of the large employment center in the Upstate (BMW) and the Triangle (RTP), the smaller county, and thus the smaller principle city, had more of a reliance on the larger county/principle city. But with those big singular jobs centers being established and really taking off in the smaller county in which they are located, the smaller county gets more regional influx and thus becomes an employment center in its own right, although it's obvious that those large employment centers are truly regional in nature. That's why there's more justification for the Upstate and Triangle being recombined and less for the Triad, which lacks that sort of dynamic.