It may be due to China's near-monopoly on Heavy Rare Earths, used in the manufacture of iPads, iPhones... solar panels, wind turbines, hybrid car batteries and weapons guidance systems. China has been very effective at leveraging their supply of Heavy Rare Earths into manufacturing jobs.
No doubt wages and environmental regulation are important factors. But are HRE being overlooked when manufacturing jobs are being discussed? (Would love to hear from someone involved in manufacturing similar products on how critical this is!)"
Link to Original Source