Facts About Immigration and the U.S. Economy"For the United States as a whole, immigrants’ share of total output was about 14.7 percent over 2009–2011. Note that this is actually larger than immigrants’ 13 percent share of the population."
"There is a fairly broad consensus that the present value of the long-run net fiscal impact of unauthorized immigration, at all levels of government combined, is small but positive—meaning that immigration reduces overall budget deficits
Without immigration, the U.S. economy looks like sclerotic Old Europe
"So, population growth is good for economic growth
. This seems intuitive — more people means more economic activity. And in the U.S., population growth is increasingly reliant on immigration. Sure, birth rates are higher in the U.S. than in other wealthy countries, but they are on the decline, and the Census bureau estimates that immigration will be the main driver of population growth within 30 years."
"In other words, not only does immigration boost growth, it also combats the kind of concentration of wealth that has fueled political unrest across the developed world
. Population growth doesn’t make the rich any poorer, but it does diminish the power of wealth. A million dollars is going to be a much more valuable thing to have in a country in which the population and economy are shrinking than in a country where the population and economy are growing."http://fortune.com/2014/03/05/without-immigration-the-u-s-economy-looks-like-sclerotic-old-europe/