One of the defining narratives of modern China has been the migration of young workers—often girls in their late teenage years—from the countryside into sprawling cities for jobs in factories. Many found work at Foxconn, which employs nearly one million low-wage workers to hand-assemble electronic gadgets for Apple, Nintendo, Intel, Dell, Nokia, Microsoft, Samsung, and Sony.

So it was a surprise when Terry Guo, the hard-charging, 61-year-old billionaire CEO of Foxconn, said last July that the Taiwan-based manufacturing giant would add up to one million industrial robots to its assembly lines inside of three years.