By Steven Barnett

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Mongolia’s economy grew nearly 12 percent last year, the United States around 2 percent. So Mongolia grew around 6 times faster than the United States, yet of course the United States contributed more to GDP growth—over 150 times more. Why, because size matters.

Let’s apply this logic to China. A bigger but somewhat slower growing China of the future will contribute about as much to global demand as the smaller but faster growing China of before. This is arithmetic: An economy that is twice as big can grow by ½ […]