Total household disposable income in 2008 is estimated to be Rmb23.2 tn, Rmb9.3 tn higher than the Rmb14 tn calculated based on the official NBS household income survey and Rmb5.4 tn higher than the Rmb17.9 tn total calculated by the Flow of Funds (FOF) accounts in the Economic Census This Rmb5.4 tn is referred to as grey income.
FORBES: The Chinese Have $1.5 Trillion In Hidden Income