When American companies moved manufacturing to China, it was all about cost. China’s wages were among the lowest in the world and its government provided subsidies and turned a blind eye to labour abuse and environmental destruction. Things have changed. China’s labour, real estate and energy costs have increased to the point that they are comparable to some parts of the US. Subsidies are harder to get and Chinese labour is not tolerating the abuse that it once did. China is now a more expensive place to manufacture than Indonesia, Thailand, Mexico and India, according to Boston Consulting Group. Add...