In July, Denmark's central bank, Nationalbanken, cut the rate itpays on deposits from banks to negative 0.2%, in effect chargingbanks for holding their money. The Danish experiment with rates isbeing watched worldwide, according to a Financial Timesstory posted on CNBC.

Denmark is not a member of the euro zone, and Nationalbanken wasstriving to maintain the Danish kroner's peg to the euro asskittish investors looking for a safe haven moved money to Denmark.The negative yield could also encourage banks to lend more, ratherthan paying up to hold funds at the central bank.

Central banks have been keeping official rates quite low toencourage growth, but negative rates are still a novelty, althoughSweden employed them in 2009 and 2010. But the story cites reportsthat the European Central Bank recently warned that its depositrate, currently at zero, could go negative.