China and India account for about 80 per cent of investment expenditure in the Asia and the Pacific region.
Russia accounts for 77 per cent of CIS, Brazil for 61 per cent of Latin America and Saudi Arabia 40 per cent of Western Asia, it said.
The report said low-income economies, as a share of world GDP, were more than two times larger based on PPPs than respective exchange rate shares in 2011.
Yet, these economies accounted for only 1.5 per cent of the global economy, but nearly 11 per cent of the world population.
Roughly 28 per cent of the world's population lives in economies with GDP per capita expenditure above the $13,460 world average and 72 per cent are below that average.
The approximate median yearly per capita expenditure for the world — at $10,057 — means that half of the global population has per capita expenditure above that amount and half below, it said.