The policy challenge is to align the interests of the migrants with the source and destination communities, not how to stop the economic development of people.
The demand for labor explains a lot of migration patterns. Where the uneducated once moved to staff large industrial centers, now those with the means and a college education flock to feed the Innovation Economy that is rising from their ashes.
Our metrics of urban neighborhood health fail to capture individual success stories, which is why we see South Central Los Angeles, which has a history of successfully encouraging social mobility, as a place with persistent poverty.