China's population is expected to start dropping around 2030, and when that happens, there will be royal economic fuckage. Inverted population pyramid = few workers supporting lots and lots of retirees = bad.
http://www.iiasa.ac.at/Research/LUC/ChinaFood/data/pop/pop_22.htm
http://carriedaway.blogs.com/carried_away/2003/11/why_i_dont_fear.html