DEAL EXTENDED: Six of the world's leading central banks, including the U.S. Federal Reserve, say they will provide each other with ready supplies of currency on a standing basis, extending arrangements set up to steady the global financial system during post-2007 turbulence.

DEAL EXTENDED: Six of the world's leading central banks, including the U.S. Federal Reserve, say they will provide each other with ready supplies of currency on a standing basis, extending arrangements set up to steady the global financial system during post-2007 turbulence.

HEAVY HITTERS: The central banks are: the Fed, the European Central Bank, the Bank of Japan, the Bank of England, the Bank of Canada and the Swiss National Bank.

READY CASH: The so-called swap lines enable those central banks to make sure banks in their home countries can always borrow ready cash from them in any of the currencies involved, should they need it.