Few weeks ago, The Economist magazine published a short piece on the world's shifting centre of gravity*. The map is based on this study by the McKinsey Global Institute.
According to the study, "the centre is rapidly shifting east—at a speed of 140 kilometres a year and thus faster than ever before in human history". As you have already guessed, the main reason for this is rapid urbanisation in developing countries, in particular China.
*The global center of gravity is calculated weighting the approximate centre of landmass of the world by countries' GDPs.
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