This study develops long-term forecasts for world economic growth, based on a production function according to which an economy can grow by (1) deploying more inputs (labor and capital inputs) to production and/or by (2) becoming more efficient, i.e. producing more output per unit of input. An econometric analysis of past performance is carried out to describe the process by which physical capital accumulates over time and to estimate the parameters of a catch-up model of technology diffusion. We moreover account for the modification of real exchange rates against the US dollar. The results suggest that today’s advanced economies are to become a shrinking part of the world economy: in less than 50 years, China and India together could match the size of the US in current dollars (26.6 against 26.9% of the world GDP in 2050). China and India will stand out as an engine of new demand growth and spending, their GDP will grow at yearly average rate of 4.6 and 4.5%, respectively between 2005 and 2050. The largest economies in the world (by GDP) may no longer be the richest (in terms of income per capita).
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Paper provided by CEPII research center in its series Working Papers with number
2006-16.