The US could lose its crown as the world's biggest economy as soon as next year, according to data from Standard Chartered. Once it falls behind China, it is unlikely ever to regain the top spot, and by 2030 could also be behind India. By 2030, the bank said, Asian GDP will account for roughly 35% of global GDP, up from 28% last year, and just 20% in 2010. Seven of the world's 10 largest economies will be in Asia in the next decade.