Talking about Purchasing Power Parity (PPP), China Stands at
the very top in the global ranking, followed by USA and India. However, a study
found that by 2020, India will topple USA from spot number two, becoming the
second largest economy in terms of PPP.
In terms of Gross Domestic Product (GDP), by 2030, China
will take over USA. And by 2050, India will take over USA, grabbing the second
spot.
So yes, India might beat USA, on different economical
fronts, in coming decades, China with reign at the top.