“research that has looked at the effect of refugees around the world suggests that, in the longer run, this view is often wrong. From Denmark to Uganda to Cleveland, studies have found that welcoming refugees has a positive or at least a neutral effect on a host community’s economy and wages.
…beyond the upfront costs of processing and settling refugees, the perceived burden of refugees on a host economy may not be as significant as it seems. “There’s not any credible research that I know of that in the medium and long term that refugees are anything but a hugely profitable investment,” says Michael Clemens, a senior fellow who leads the Migration and Development Initiative at the Center for Global Development, a Washington think tank.”
http://www.washingtonpost.com/news/wonkblog/wp/2015/09/10/the-big-myth-about-refugees/
IR Theory & Practice 