Britain's Chancellor of the Exchequer Alistair Darling (R) and Deputy Governor of Bank of England Charles Bean attend a G7 finance ministers and central bank governors meeting in Rome February 14, 2009. LONDON, Aug 25 (Reuters) – The financial crisis has tipped the arguments in favour of central banks acting to stem asset-price bubbles but they will need new instruments to help them do this, Bank of England Deputy Governor Charles Bean said on Tuesday.

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