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