$37 billion per year citing Mainstream economists $37 billion per year roughly $37 billion each year roughly $37 billion each year roughly $37 billion each year roughly $37 billion each year roughly $37 billion each year roughly $37 billion each year roughly $37 billion each year Mainstream economists roughly $37 billion each year roughly $37 billion each year roughly $37 billion each year roughly $37 billion each year persuasions that immigrants give more than they take study published by the National Research Council roughly $37 billion each year expertos economistas have a positive impact on the economy expertos economistas Mainstream economists roughly $37 billion each year Mainstream economists entrepreneurial activity "Immigration's Economic Impact" roughly $37 billion each year roughly $37 billion each year Mainstream economists roughly $37 billion each year evidence roughly $37 billion each year report roughly $37 billion each year roughly $37 billion each year National Research Council that immigrants give more than they take roughly $37 billion each year found