European Central Bank policy makers Benoit Coeure and Ignazio Visco underlined that their new bond-buying program will be extended if it doesn't show results. "If we haven't achieved what we want to achieve," said Coeure, the ECB's head of market operations, "then we'll have to do more, or we have to do it for longer." Visco, the Italian central-bank governor, said earlier on Friday that "we are open-ended" about asset purchases. Both men spoke in Bloomberg Television interviews in Davos, Switzerland, where they were among a small coterie of Governing Council members who traveled to the Swiss resort after completing an historic monetary-policy decision in Frankfurt. ECB President Mario Draghi pledged to buy 60 billion euros ($68 billion) a month of assets including government bonds through September 2016.