I thought this segment of prof. Cowen’s NYT op-Ed was brilliant:
(…) Michael Clemens, a senior fellow at the Center for Global Development in Washington, quantified these gains in a 2011 paper, “Economics and Emigration: Trillion-Dollar Bills on the Sidewalk?” He found that unrestricted immigration could create tens of trillions of dollars in economic value, as captured by the migrants themselves in the form of higher wages in their new countries and by those who hire the migrants or consume the products of their labor. For a profession concerned with precision, it is remarkable how infrequently we economists talk about those rather large numbers.
Truly open borders might prove unworkable, especially in countries with welfare states, and kill the goose laying the proverbial golden eggs; in this regard Mr. Clemens’s analysis may require some modification. Still, we should be obsessing over how many of those trillions can actually be realized.
IN any case, there is an overriding moral issue. Imagine that it is your professional duty to report a cost-benefit analysis of liberalizing immigration policy. You wouldn’t dream of producing a study that counted “men only” or “whites only,” at least not without specific, clearly stated reasons for dividing the data.
So why report cost-benefit results only for United States citizens or residents, as is sometimes done in analyses of both international trade and migration? The nation-state is a good practical institution, but it does not provide the final moral delineation of which people count and which do not. So commentators on trade and immigration should stress the cosmopolitan perspective, knowing that the practical imperatives of the nation-state will not be underrepresented in the ensuing debate.