I read the Wharton Study's first three conclusions,  and they are all based on theory, not evidence.  First, they claim that any immigration causes positive economic effects.  Secondly they claim that Americans who lose their jobs to illegal or legal immigrants are outweighed by the positive effects of the immigrants, and thirdly they claim that the use of immigrants to nanny children allows American women to more fully participate in the economy. As if Americans cant be nannies.  One only needs to remember that Marx was an economist and his theories on the organization of Russia's economy bankrupted the country and are about to do the same to Venezuela.