As rebukes go in the close-knit world of central banking, few hurt as much as the scathing indictment of US Federal Reserve policy by Professor Anna Schwartz.

The high priestess of US monetarism - a revered figure at the Fed - says the central bank is itself the chief cause of the credit bubble, and now seems stunned as the consequences of its own actions engulf the financial system. "The new group at the Fed is not equal to the problem that faces it," she says, daring to utter a thought that fellow critics mostly utter sotto voce.