China GDP has been much underestimated for years, because

small business is normally not countered to contribute the national GDP - that may be as high as half or even more of the GDP released by the NSB. In one word, China GDP could be doubled of the released figure, i.e. the real GDP of China in 2014 being about $28 trillions US, equivalent to about $20,000 per capita. Thus, there is not doubt that China is the largest economy of the world, although its per capita is still lower than the developed countries (e.g., USA $57,000, Germany $47,000 in 2014).