http://www.youtube.com/watch?v=sDh3FNuwrTc
listen to this, best explanation on trade by Peter Schiff
I get it. Company ABC can make product x for y dollars in the US and sell it for price z. If you can get slaves to build it for you for (y - 10%) and still sell it for price z. This works until our currency is worthless.
PS most of the jobs off shored were non-union.