A recurring policy question in the early 2010s was whether China, India and the rest of Asia could sustain growth without renewed demand from consumers in the United States—or whether Asian economies were themselves becoming a principal engine of global expansion.
The study approached that question through economic geography. It defined the world economy’s “centre of gravity” as the average location of economic activity across the Earth, calculated in three dimensions. The underlying exercise combined purchasing-power-adjusted income data with the geographic locations of urban and rural activity.
How the measure was constructed
Income and location information from international and geographic datasets was assembled to identify nearly 700 places where economic activity could be estimated. National income was distributed across urban agglomerations and rural areas to create a more detailed map than country-level points alone would allow.
Using purchasing-power parity gives lower-income economies more weight than a calculation based only on market exchange rates. The original analysis noted, however, that rapid growth in those economies could reduce the size of this valuation effect over time. Any interpretation therefore needed to distinguish the influence of the measurement method from the influence of real changes in output.
An eastward movement
The model placed the centre of global economic activity in the mid-Atlantic in 1980, reflecting the dominant combined economic weight of North America and Western Europe. By 2008, the calculated point had moved to an area east of Helsinki and Bucharest.
This did not imply that the economies nearest the plotted point had caused the movement. Rather, a centre of gravity is a weighted average: the expansion of China, India and other Asian economies pulled the global average eastward. In the original calculation, the surface projection shifted by about 4,800 kilometres between 1980 and 2008.
What the archive study argued
- The geographic distribution of global output had been moving east for several decades.
- Asia’s contribution to world growth predated the recovery from the 2008 financial crisis.
- The movement represented a long-run change in relative economic weight, not merely a short business-cycle fluctuation.
- Long-range projections were conditional extrapolations, rather than guaranteed destinations.
Why a three-dimensional model matters
The mathematical centre did not have to sit on the planet’s surface. The original calculation commonly located it thousands of kilometres below the surface, because it averaged points positioned around a sphere. Showing that movement on a familiar flat map therefore required a projection, and every projection introduced some distortion.
To make the trend readable, the study projected the calculated point onto a cylinder aligned with the Earth’s north–south axis and tangent at the equator. Historical positions were shown at three-year intervals, while smaller differently coloured points represented the projection available at the time.
Reading the projection today
The historical series supported a clear conclusion: global economic activity had become less concentrated around the North Atlantic and more geographically balanced toward Asia. The study’s extrapolation suggested that the centre could continue toward the area between India and China by mid-century.
That projection should be read as an illustration of assumptions about continuing relative growth. Forecast paths can change with productivity, demographics, exchange rates, policy, conflict, climate pressures and revisions to economic data. The durable contribution of the exercise is its visual framework for thinking about the distribution of world output.
Rather than treating the global economy as a contest between a few headline national totals, the centre-of-gravity approach shows how many locations jointly reshape the world’s economic map over time.