Here are slides from a presentation by Lant Pritchett that might suggest "yes" (HT: Will Wilkinson). They summarize some key points and make a forceful case for open borders as a force for poverty alleviation. There are some who reflexively quote Milton Friedman's statement that a country cannot have both free immigration and a welfare state, but I think this is more of an argument against a welfare state than it is against free immigration.
The statesman who should attempt to direct private people in what manner they ought to employ their capitals would not only load himself with a most unnecessary attention, but assume an authority which could safely be trusted, not only to no single person, but to no council or senate whatever, and which would nowhere be so dangerous as in the hands of a man who had folly and presumption enough to fancy himself fit to exercise it. -Adam Smith
