The property correction is deemed benign because it is planned. Premier Wen Jiabao wishes to forces down prices as a social welfare policy. Yet did the Fed not slam on the brakes in 1928 to choke an asset boom? Did the Bank of Japan not do likewise in 1990, only to find that boom-bust deflation has its own fiendish momentum? Once you let credit rise by 100pc of GDP in five years – as China has, more than in those US or Japanese episodes – you are at the mercy of powerful forces.