... levels is expected to increase from 18% in 2011 to 44% in 2050) . The UK is ranked fourth within the G7 countries in terms of projected GDP per capita in 2050, behind the US and, to a much lesser ... Some of the risks to the projections relate to economic assumptions in the model. In particular, there could be: Diminishing returns to capital investment in emerging economies such as China, ... Italy and China are expected to see the largest declines in the share of the prime working age group over the period to 2050. Significant ageing effects are 16 The model goes back to the Nobel...