From the Economist:
It is not exactly news that the world’s economic centre of gravity is shifting east. But it is striking how fast this seems to be happening. In a new study on the economic impact of urbanisation the McKinsey Global Institute, the research arm of the eponymous consultancy, has attempted to calculate how this centre of gravity has moved since AD 1 and how it is likely to move until 2025. Although the underlying maths (which involves weighting the approximate centre of landmass of a country by its GDP) has to be taken with a pinch of salt, the calculations show that the centre is rapidly shifting east—at a speed of 140 kilometres a year and thus faster than ever before in human history, according to Richard Dobbs, one of the authors of the study. The main reason for this is rapid urbanisation in developing countries, in particular China.