By 2050, India and China will make up 50% of total world GDP, with United States and European Union at 10% each. The combination of GDP PPP of United States and European Union will equal only two either India or China, but not both.
http://www.wired.com/beyond_the_beyond/201...india1-japan-9/Following will be the 10 largest economies in the world in 2050:
1. India: $85.97 trillion
2. China: $80.02 trillion
3. United States: $39.07 trillion
4. Indonesia: $13.93 trillion
5. Brazil: $11.58 trillion
6. Nigeria: $9.51 trillion
7. Russia: $7.77 trillion
8. Mexico: $6.57 trillion
9. Japan: $6.48 trillion
10. Egypt: $6.02 trillion.