http://en.wikipedia.org/wiki/BRIC

Gross Domestic Product (nominal) [2050][16]
Rank ↓ Country ↓ GDP (in US$ millions) ↓

1 Flag of the People's Republic of China.svg China 70,710,000
2 Flag of the United States.svg United States 38,520,000
3 Flag of India.svg India 38,227,000
4 Flag of Brazil.svg Brazil 11,366,000

5 Flag of Mexico.svg Mexico 9,343,000
6 Flag of Russia.svg Russia 8,564,000
7 Flag of Indonesia.svg Indonesia 7,010,000
8 Flag of Japan.svg Japan 6,675,000
9 Flag of the United Kingdom.svg United Kingdom 5,178,000
10 Flag of Germany.svg Germany 5,028,000

11 Flag of Nigeria.svg Nigeria 4,640,000
12 Flag of France.svg France 4,592,000
13 Flag of South Korea.svg South Korea 4,083,000

14 Flag of Turkey.svg Turkey 3,948,000
15 Flag of Vietnam.svg Vietnam 3,607,000
16 Flag of Canada.svg Canada 3,164,000
17 Flag of the Philippines.svg Philippines 3,010,000

18 Flag of Italy.svg Italy 2,950,000
19 Flag of Iran.svg Iran 2,663,000
20 Flag of Egypt.svg Egypt 2,602,000
21 Flag of Pakistan.svg Pakistan 2,085,000

22 Flag of Bangladesh.svg Bangladesh 1,466,000

probably some of the countries on that list will disappear until 2050. until then, hard work and vigilance is needed.

Population growth will make GDP gains useless.