How does it grow by 3000 TIMES? Because you said so? That's a crazy prediction without having a Statistical model anywhere that I've seen....care to provide some facts and proofs? Remember, these are estimated. I can pay John Doe to write about my economic forecast to be in the top 30 countries (if I was a country) and had growth potential. How it actually works out, it may be very different than the anticipation. But the general rule of thumb is that the Chinese and the Indians will claim 2 top spots. US will be a third one, Pakistan will be the top 15th economy, and the rest. Here's a good comprehensive article. I thin the Western sources deflate the Chinese potential now a days for obvious reasons, but we'll see what comes in the future:
China, India To Lead World By 2050, Says PwC | The Diplomat