And I'll add that Apple is one of the best companies to put pressure on. They have a super-strong strong brand and their products often fetch higher prices and profit margins than their competitors. This gives them a strong incentive to protect their brand, and the means to do so.

Part of the reason their products can demand a premium price and healthy profit margins is because they have high standards for quality, profit margins and quality both rely on a strong and well managed supply chain. This well managed supply chain gives Apple greater ability than most to extract compliance with their required labor standards. The demand for quality means, in part, that Apple's suppliers make a greater investment in training their workers, which makes retaining those workers more important.

If Apple's suppliers attract and retain workers with better pay and better working conditions, then that creates pressure on other manufacturers, who must improve the package they offer workers in order to keep them from going to work for Apple's suppliers.

I'm sure there are other good targets for this sort of pressure, but Apple has to be among the best.