It'd be useful to study the pairwise origin and destination of the domestic moves. That would lend insight into whether the gains posted by Sunbelt metros are l

It'd be useful to study the pairwise origin and destination of the domestic moves. That would lend insight into whether the gains posted by Sunbelt metros are largely of the rural-to-urban nature (or small metro to large metro, but still nearby), or whether most domestic arrivals are coming from places further away, from other regions of the country. After all, the former kind is the usual urban concentration we've seen for a while, while the latter might be indicative of broader demographic trends like the Great Northward Migration, or the first Sunbelt Boom.