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The Chinese National Bureau of Statistics measured the size of China’s GDP at PPP in 2014 at $10.6 trillion. This is the basis for our estimate of a $10 trillion economy in 2013. http://www.stats.gov.cn/enGliSH/
There is considerable variance in these estimates. Both the IMF and the World Bank estimate China’s 2013 GDP PPP at above $16 trillion. The CIA estimates this figure at $13 trillion.