I don't agree with some of Lang's economic views, such as his view on Keynesian economics, the prospect of China's economy for the next stage, but I think his view of this fourth cart has some merits even though I have not thought through this carefully yet.
Lang is good at firm behaviour study.
China needs to move up a ladder in terms of production chain and there is no question about that.
Also, the Chinese is so big and there are always some firms that will be on relatively higher position in terms of the production chain.