@Walter Hinteler,
increasing wages in China
We have friends with a factory in China - NOT cheap T-shirts - who has told us that within the next three years they are thinking about leaving China and within the next 10 years China will not be interesting.
A country has to have international airports and harbours, something missing in Africa, which would have cheap labours.
Also there are times when it is very difficult to get a visa to visit China which makes it difficult to go there as a businessman.