If there wasn't an endless supply of people willing to work for $2/hour, employers would have to pay what people ARE willing to do the work for. If someone is going to come back with, well, then things would cost more..... yes, probably true, but think of all the less taxpayers would have to dish out in aid.... i'm willing to pay a little more for my tomatoes and way less in taxes.
btw, my mother cleaned office buildings in downtown Chicago for 40-ish years ... it was a union job that paid reasonably well for an immigrant with no schooling and no experience ..... people just naturally tend to gravitate towards the jobs that people who came to this country before them have
and i bet there are plenty of people on welfare who would be willing to work those $2/hour jobs, except that it wouldn't be enough to support their families.... and as long as there are so many willing to work for $2, they will remain $2/hour jobs.