China is already the worlds largest economy

  It's the largest economy in the world. GDP is simply the money supply. Its a relationship between quantitative easing and fractional reserve lending. Appreciating the currency against foreign currencies would also allow the GDP to rise. And depreciating the currency against foreign currencies would also allow the GDP to fall. So when we measure the Chinese GDP, we are measuring its total sum of liquid instruments at today's exchange rate. But when we measure China's total physical economy. All goods and services produced, then it is already unrivaled. If it was possible to quantify all of the buildings, trains, automobiles, air planes, ships, and a myriad of other things, its already the largest economy in the world.