To the extent that their spouses come with them instead of them marrying a native they are surely more likely than average to have high IQ children who generate positive peereffects, and high-skilled spouses who also contribute to the economy through a job of their own or household production.
Gregory S. Berns, a psychiatrist at Emory, is using brain imaging to demonstrate the effects of peer pressure on individual perception, with the idea of explaining the development of fads, from investment trends to the popularity of Burberry plaids and belly button rings.