Investment has indeed grown far faster than GDP. From 2000 to 2010, growth of gross fixed investment averaged 13.3 per cent, while growth of private consumption averaged 7.8 per cent. Over the same period the share of private consumption in GDP collapsed from 46 per cent to a mere 34 per cent, while the share of fixed investment rose from 34 per cent to 46 per cent.
Professor Pettis argues that suppression of wages, huge expansions of cheap credit and a repressed exchange rate were all ways of transferring incomes from households to business and so from consumption to investment. Dwight Perkins of Harvard argued at the China Development Forum that the “incremental capital output ratio” – the amount of capital needed for an extra unit of GDP – rose from 3.7 to one in the 1990s to 4.25 to one in the 2000s. This also suggests that returns have been falling at the margin.If this pattern of growth is to reverse, as the government wishes, the growth of investment must fall well below that of GDP. This is what happened in Japan in the 1990s, with dire results.