THE financial crisis was grim, but the most important global economic development in the early 21st century was a positive one: the dramatic acceleration of growth in the emerging world. Between 2000 and 2009 output per person in poor countries excluding China grew an average of 3.2 percentage points a year faster than rich ones—an unprecedented pace of catch-up. Global poverty rates tumbled. Were that pace of convergence to be sustained, average income in those countries would reach America's in about 44 years.
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