As Draghi said in a speech to Asian government officials and business leaders on Monday, there’s still a great deal more that can be done to punish Europe’s hordes of savers, the central banker’s scapegoat du jour for all that ails Europe’s debt-laden economy. The low or negative interest rates plaguing Europe are a symptom of a much bigger problem, he said: the compression of investment returns due to a massive global savings glut. To our great amazement, it’s this purported glut — and not his monetary policies — that lies behind the historic decline in interest rates. Inevitably, whenever...