As a consequence, they see China and the United States having roughly equal levels of GDP in 2015 (assuming PPP valuation). Time will tell how realistic those projections are. Some risks are evident in the case of, say, the necessary transformation of loss-making state enterprises and urgent reforms in the financial sector in China - to mention just two economic factors.
With respect to the United States, we have recently observed relatively high productivity growth rates, which might contribute to higher-than-expected GDP levels in the US, but the risks arising from the twin deficits in the medium term should not be underrated.