Unless you think preventing uneducated, unskilled, labor-intensive, non-taxpaying employees from entering the United States will hinder our economy.
Considering the other wacky economic views propounded by the economically illiterate FROBLs on this thread that belief wouldn't surprise me, to be quite honest.
"Walls are not economic barriers." If you say so.
http://www.wall-berlin.org/gb/ciel.htm
Europe, China, and every other country that has had (note the past tense) walls disagrees. I am still anticipating the link that proves that only God fearin' Americans pay taxes. This link shows that a whole gob of them durned feriners pay taxes:
http://www.irs.gov/businesses/international/article/0,,id=96739,00.html
Repeating rhetoric does not make it factual.