text:  Former President Donald Trump campaigns a lot on immigration. He says immigrants make wages go down, and he says they take jobs from Americans. Amanda Aronchik looks into these claims for NPR's Planet Money. Economists have actually been trying to answer this question for decades. Do immigrants take jobs and lower wages? In fact, it's the subject of one of the most famous papers in the field of economics. The story begins in April 1980. It was a big deal in the news. Cuba.