It seems intuitive that a free market would lead to a "race to the bottom." In a global marketplace, profit-chasing employers will cut costs by paying workers less and less, and shipping jobs to China. It's a reason that progressives say government must step in. So America now has thousands of rules that outlaw wages below $7.25 an hour, restrict unpaid internships, and compel people to pay union dues. These rules appear to help workers, writes John Stossel, but they don't.