It pays to be bilingual …

Even CNN says so. Interesting story, because it emphasizes the positive aspect. In the sidebar on 'highlights', for example, you see these two points together as the lead:

• In almost every line of work, speaking a second language makes you valuable
  
• Twenty percent of Americans don't speak English at home

Of course those numbers were far higher in many parts of the country in the 19th c. and it's good to keep that in mind too.