Get ready for a new economic order. In the world 15 years from now, the U.S. will be far less dominant, several emerging markets will catapult into prominence, and some of the largest European economies will be slipping behind.  

That's according to the U.S. Department of Agriculture's latest macroeconomic projections that go out to 2030, displayed in the chart below. The U.S. will just barely remain the global leader, with $24.8 trillion in annual output. The gray bar represents the $16.8 trillion gross domestic product projected for 2015, and the green bar shows how much bigger the economy is expected to be 15 years from now. The country, worth 25 percent of the world economy in 2006 and 23 percent in 2015, will see its share decline to 20 percent. 

China's GDP will grow to more than twice its size today, helping the Asian powerhouse to almost entirely close its gap with the U.S. 

India, ranked eighth for 2015, will climb past Brazil, the United Kingdom, France, Germany and Japan to take third place in the world ranking. The International Monetary Fund calls India "the bright spot in the global landscape." The country will have the largest workforce in the world within the next 15 years, the IMF notes, and among the youngest.

David Fuller's view

I think Bloomberg is right about the top three in 2030, but has the wrong order.  My guess is that China will be in first position, followed by the USA and then India.