I've worked in a call centre, and it wasn't a sweatshop, but one of our managers came from another one, and it was VERY clear it was a sweatshop. Workers were terrified, worked WITHOUT breaks, and barely understood what they were doing. I don't actually understand how they made money, because it seemed that no-one in their right mind would have been ABLE to buy anything from them.
Having said that, no-one's arms came off after getting caught in a phone headset.
Going back to the initial question I put it to a chap I mett today over lunch and his response was to point out:
If you fail to post a sufficiently healthy profit, people dump your stocks and then EVERYONE loses their jobs. So well done, Kaft, instead of 1500 redundancies you've got a nabjillion.