The euro was a big loser Thursday after Mario Draghi, the European Central Bank's president, said the institution was ready to charge banks that decide to keep deposits at the bank. A negative deposit rate would ostensibly push banks to lend more rather than hoard cash. Draghi conceded he was "frustrated" that the banks weren't lending more.

http://business.time.com/2013/05/02/euro-falters-on-ecb-hint-of-negative-deposit-rate/