"Studies show that legalization of illegal immigrants would boost the U.S. economy; a 2013 study found that granting amnesty to illegal immigrants would raise their incomes by a quarter (increasing U.S. GDP by approximately $1.4 trillion over a ten-year period), and a 2016 study found that "legalization would increase the economic contribution of the unauthorized population by about 20%, to 3.6% of private-sector GDP.