Here's some links to illustrate my point that cheap labor is no excuse for a lack of ethics. Even though the people may have made the same or no money before the company moved in, it doesn't mean they can't keep humane standards and pay a decent wage for the country they are in. Even a decent wage in a poor country is a savings.

Confessions Of A Sweatshop Inspector
What is a Sweatshop?
Piece Work
sweatshop - Wikipedia