For the benefit of all, George Magnus of UBS sums up the chief problem now facing China in one neat mathematically charged paragraph:

The maths are problematic. If investment is 50% of GDP and the growth rate falls from 15% to say, 5% per annum, consumption growth has to accelerate from about 8% to an unprecedented 12% per annum or so if the underlying GDP growth rate is to stay at 7.5%. You can do the maths of alternative scenarios at leisure, but the bottom line is that rebalancing requires investment to grow more slowly than GDP, and consumption significantly faster over an extended period of time. Otherwise the model isn’t changing.

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