As the YOUNG migrate to cities to work in factories, in construction sites or in the urban services, the workforce in the rural economy is getting tight!
Productivity enhancement equipment, to replace the "drudgery of manual labour" becomes more prominent. In the early 1980's, you have probably 1 worker for every 3 mu of arable land. By 2018, it'll probably be 1 worker in every 2 or 3 hectare of land. The worker will probably be aged.
The BOOMS in almost all sector of the economy of the NEW MIDDLE KINGDOM is coming!