I took a class on NAFTA in 97 when getting my MA in Econ, and the Prof argued these same outlandish, arguments. Especially redundant was the one where one industry is down, you can simply go to another. Think about that one from a common sense viewpoint, not an economists one.. First of all, most of those employed in a manufacturing situation have little if at all above a HS Diploma educationally wise. Automatically, this creates large limitations on their profitable employment. Which is the second strike they face when looking for a new job. With a large number of unemployed, low or unskilled workers searching for a job, what is the incentive for an employer to offer high wages? Re-thinking their position might be a good idea.