[mcguire]

"That's how it worked a hundred years ago, with a huge portion of people leaving countryside to relocate in urban centers, that's how it transformed China recently (uncountable millions of people moving from inland farming to their east coast manufacturing),..."

There is the minor difference of moving from one location to take up relatively lucrative, but largely unskilled, jobs and moving from one location with a low-skilled job to try to find a high-skilled job. Or even from one high-skilled job to a completely different high-skilled job.