There is a potential for a billion of these "jobs Americans won't do". There is even a potential for a billion jobs Mexican illegals are unwilling to do.
If slavery were made legal, billions of "labor opportunities" would open right here in the US.
A "job Americans won't do" is a job that should be done elsewhere.
A "job Americans won't do" would include investment banking - if it only paid $3/hour. These bogus arguments get circulated by companies that would LOVE the creation of a whole sub-citizen class of "guest workers" in this country. What a gift to corporate America - workers that won't complain, collective bargain or sue, will work for sub par wages in sub-par conditions, and can be sent away after a few years for another fresh batch.