The ascendance of the South's economy was a key factor behind the return migration, Frey said.

CNN: Family roots lure many African-Americans back to South

In addition, since inventory migration reflects the popularity of our rent and return anywhere capability, we have made adjustments in our field processes to minimize the impact of higher levels of migration on overall rentals.

FORBES: Redbox Lays An Egg: Coinstar Shares Swoon On Weak Q4

If we take the steps set out today, and deal with all the different avenues of migration, legal and illegal, then levels of immigration can return to where they were in the 1980s and 90s, a time when immigration was not a front rank political issue.

BBC: In full: David Cameron immigration speech

In return for closer ties with the United States, Mexico seems willing to act as a cushion against migration.

ECONOMIST: Mexico��s foreign policy