Why the U.S. will remain the world's leading economy for longer than expected

Economists believe the U.S. could lose its ranking as the world's leading economy in the 21st century, as measured by gross domestic product. But the U.S. is set to extend its run through the 2020s, on the back of slower-than-expected growth trends in China. Investors are now placing fresh bets on emerging markets as the working-age population booms in the Indo-Pacific.