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The world’s dependence on these two dynamos is partly a reflection of subdued growth elsewhere. Europe’s share of overall output is the same as North America’s, but the continent is expected to expand by little more than 1% next year. Japan’s economy, meanwhile, is only slightly smaller than China’s. However, even with the help of an Abenomics revival it is expected to grow by just 1.4%, which means its share of overall growth will be just 4%.
The calculator also shows how sensitive forecasts are to changes in growth rates. Any acceleration or slowdown in the United States will be felt by the rest of the world – not just through trade and investment but through changes to the Federal Reserve’s money-printing policy.
If China’s economy grew by a disappointing 6%, meanwhile, it would shave less than 20 basis points off world GDP growth.
A relatively small acceleration in Europe’s rate of expansion, to 1.8%, would boost overall growth by the same amount.
The fortunes of emerging markets such as India and Brazil will doubtless attract a great deal of interest, especially if the Fed begins to turn off the tap of cheap dollars.
But when it comes to setting the overall direction of the world economy, these countries hardly register. On current forecasts, global growth is very much a two-horse race.