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Honestly, the impact will probably be very limited. I suspect that Apple will press for curtailment of the most egregious of the labor practices at FoxConn, and I suspect FoxConn will become better at concealing them. There are reasons that it is cheaper to manufacture products in China than the US, aside from a robust and versatile supply chain for tech product components in China. There is no OSHA (and even though some people think of that as a good OSHA="gubment", look at the reduction in the rate of workplace deaths and injuries since OSHA came into being). There are no unions to advocate for reasonable hours, pay and working conditions. I don't mean to sound overly relativistic, but China is not the U.S. or Europe, and it can be easy to expect conditions there be comparable to what we in the west are accustomed to for workers. At the same time, before we shake out heads and tsk-tsk too loudly, people might want to see what conditions are like in the US for migrant workers. I grew up in the South where workers were in the fields when it was 90+ degrees doing back breaking labor for little pay. They also lived in overcrowded facilities. Perhaps things have changed since I left, but I've seen nothing at FoxConn that is worse than the conditions I saw for many of the field hands in my youth.
Even so, most western companies don't like news stories linking them to exploitive labor practices, so I suspect that Apple has been on the phone with FoxConn trying to improve the situation if only to avoid bad press.