4. China
China, the Asian giant, is the world's fourth largest economy with a GDP of $3.281 trillion; but in purchasing power parity terms it ranks second at $7.055 trillion.
It is the world's fastest growing major economy and its giant strides have taken the world by a storm. Economists predict that over the next few decades, it could topple the US as the world's largest economy.
China's per capita income, however, is still low at $2,630 per year.
Image: Residents shop at a market in Beijing. | Photograph: Teh Eng Koon/AFP/Getty Images
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