Internationals financial regulators have eased rules on minimum quantities of cash and liquid assets all banks must hold, set to take effect in 2015.

The agreement, by the body that oversees the Basel Committee on Banking Supervision, is an attempt to make banks less vulnerable to runs.

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http://www.bbc.co.uk/news/business-20928354

For a guide to bank liquidity, check out John Bertrand's manual for banks and FIs.