London Telegraph 
May 9, 2013
China’s Development Research Council (DRC) expects growth to drop to 6pc by 2020. It could be much lower. The US Conference Board says it will average 3.7pc from 2019-2025 as the ageing crisis hits. Michael Pettis from Beijing University thinks it is likely to slow to 3pc to 4pc over the next decade, deeming this entirely desirable if it comes from taming the runaway state enterprises.
If so, China’s growth may not be much higher than the new consensus estimate of 3pc for a reborn America, powered by its energy boom and the revival of the chemical, steel, glass, and paper industries.
All those charts showing China’s economy surging past the US by 2030, or 2025, or even 2017, will look very credulous. China may not surpass the US this century.
As of last year US GDP was roughly $15.7 trillion, compared to $8 trillion for China on a nominal exchange rate basis, the measure that matters for gauging economic power.