Alan Greenspan, PhD, former Chairman of the US Federal Reserve, stated in his Apr. 30, 2009 testimony before the US Senate Subcommittee on Immigration, Refugees, and Border Security:

“[T]here is little doubt that unauthorized, that is, illegal, immigration has made a significant contribution to the growth of our economy. Between 2000 and 2007, for example, it accounted for more than a sixth of the increase in our total civilian labor force. The illegal part of the civilian labor force diminished last year as the economy slowed, though illegals still comprised an estimated 5% of our total civilian labor force. Unauthorized immigrants serve as a flexible component of our workforce, often a safety valve when demand is pressing and among the first to be discharged when the economy falters.

Some evidence suggests that unskilled illegal immigrants (almost all from Latin America) marginally suppress wage levels of native-born Americans without a high school diploma, and impose significant costs on some state and local governments.

However the estimated wage suppression and fiscal costs are relatively small, and economists generally view the overall economic benefits of this workforce as significantly outweighing the costs.”

Apr. 30, 2009