Sixteenth birthdays can be momentous occasions. A coming of age of sorts. Well, New Year’s Day 2015 the European Central Bank turned 16. It is a momentous birthday, but not all that sweet.

To be sure, there is notable good news. The new headquarters in Frankfurt recently opened. Lithuania has entered the euro area. The frequency of ECB monetary policy meetings is about to decline. And there will soon be timely publication of minutes of these meetings.

But the risk of deflation amid sustained economic weakness makes for a very anxious birthday...