THIS year will be the first in which emerging markets account for more than half of world GDP on the basis of purchasing power, according to the International Monetary Fund (IMF). In 1990 they accounted for less than a third of a much smaller total. From 2003 to 2011 the share of world output provided by the emerging economies grew at more than a percentage point a year (see chart 1). The remarkably rapid growth the world has seen in these two decades marks the biggest economic transformation in modern history. Its like will probably never be seen again.
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