What kind of numbers you want? GINI (inequality index)?: ok http://mapscroll.blogspot.com/2009/04/is-us-becoming-third-w... That the poors are doing here worse than anywhere else in developed world: obvious from the GINI.

How do I account number of people willing to immigrate: 1. It is way,way easier to move to USA, than anywhere else in developed world. 2. Proximity of Latin American/Carribean countries, which are verrry bad. And you do not need an expensive ticket from Haiti for example. Just find whatever floating and have a free ride.

Now how you account for that: http://bits.blogs.nytimes.com/2009/03/02/the-real-high-tech-... ?