Northern European countries such as Germany have historically preferred tighter monetary policy to control inflation. Southern European countries such as Italy, by contrast, are more accustomed to a looser monetary policy and to the economic stimulation that follows. Their disagreement has snowballed since the beginning of the global financial crisis, and the ECB, which governs monetary policy, is stuck in the middle. Since 2014, the south has largely had the advantage in this dispute, creating problems for Germany and friction between it and the ECB that is likely to only worsen in the coming year....