From Talking Points:
University of California, Irvine Professor Rubén G. Rumbaut…. analyzed data on adult children of immigrants in a particular region – Southern California. And he found that young bilingual adults in that region earn between $2000 and $3000 more per year than their peers who had lost their home language and become monolingual in English.

For the full story, please visit http://talkingpointsmemo.com/cafe/why-we-can-t-afford-to-turn-away-immigrants.