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The Big Mac index was invented by The Economist in 1986 as a lighthearted guide to whether currencies are at their “correct” level. It is based on the theory of purchasing-power parity (PPP), the notion that in the long run…

The global economy is changing at a dizzying pace, largely because of the accelerating speed of information technology. Knowledge, in this context, is redefined. It no longer serves us with the task of solving the mysteries of the physical world,…