However, new evidence suggests that lifelong bilingualism, or speaking two languages on a daily basis since childhood, can attenuate age-related declines in cognitive control processes (Bialystok and Craik, 2010), and may even delay the onset of dementia symptoms (Bialystok et al., 2007). Current cognitive models suggest that the basis of this boost relates to the bilingual experience of constantly switching between languages, which serves to strengthen task switching and related executive control processes (Green, 1998; Bialystok and Craik, 2010).

http://www.omniglot.com/language/articles/businesscaseforbilingualism.htm

There are far fewer bilinguals to choose from, so each bilingual has a slightly higher 'value.'

It takes into account bilingual speakers who speak English vs their monolingual counterparts who don't speak English. In our English-centric culture we often overlook that bilingualism goes both ways.

http://www.huffingtonpost.com/dan-roitman/why-it-makes-more-sense-t_b_34350...
http://www.huffingtonpost.com/dan-roitman/why-it-makes-more-sense-t_b_34350...

The key here is consciousness. While most of us rarely think about the grammatical structures of our native tongue, learning a second language brings them into stark relief. When attempting to write or speak in a second language, you suddenly have to focus more on the order of words, your verb tenses, and parts of speech. And in recognizing how sentences are constructed in a second language, you can become more
aware of how they're arranged in your first language. That more conscious approach can help you clean up your writing and your speech and help you communicate more clearly.

stutters

Acceptance of people that are different from you.

We are rich. Even the poorest of us have more that some people in third world countries.