A direct link to the blog post: http://blogs.worldbank.org/allaboutfinance/the-most-effectiv.... It's a lot more balanced than the repost linked in the submission. For example: "Such gains do not come automatically. The latest Nobel prize in economics was for work on the process of job search and matching in labor markets. While these are difficult enough for workers in the same economy, matching the supply of willing workers to the demands of employers becomes even more difficult when the process takes place across borders."