According to Ben Wey,
“The possibility of surpassing the United States, the world’s current largest economy by as early as 2030, shows that the strong growth in China in the next 20 years is very real. Nominal GDP in 2009 for China was $4.9 trillion, about 8% of global GPD, and in the U.S was $14.3 trillion, about a quarter of the global GDP.”