Jean-Claude Trichet deserves praise for fighting inflation and his handling of the financial crisis of 2007-2009. But his legacy is unfinished and we still have to see whether he will be the one who saved the euro. Important challenges remain for the incoming president. First, trust of citizens...

Euro-area inflation has been below 1 percent since October 2013, and medium-term inflation expectations are well below 2 percent. Forecasts of the return to target inflation have proved wrong. The European Central Bank should act forcefully, but should undermine neither the major relative price...