The most generous thing you can say about pushing interest rates below zero is that it was an idea ahead of its time. The experiment that turned the world of finance upside down ended this past week in Japan without having accomplished much of anything. At times it felt like 12 years in a strange new worldsort of like going south of the South Pole. Outside of the central banks that pushed the idea as a solution to stagnant growth, few people were persuaded. Wall Street still doesn't like it. Ordinary people certainly never got comfortable with the idea of being paid to borrow and charged to save money