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Why can't the Fed lower interest rates below zero?
Keep in mind that the Federal Reserve Chairman needs to be very careful with his use of words.  Here's what he said: It is arguable that interest rates are too high, that they are being constrained by the fact that interest rates can't go below zero. We have an economy where demand falls far short of the capacity of the economy to produce. We have an economy where the amount of investment in durable goods spending is far less than the capacity of the economy to produce. That suggests that interest rates in some sense should be lower rather than higher. We can't make interest rates lower, of course. (They) only can go down to zero. And again I would argue that a healthy economy with good returns is the best way to get returns to savers. So what does that mean? When he says that "we can't make interest rates lower", that doesn't mean that it isn't possible. He's saying that our demand for goods is lower than our ability to produce them. Negative interest would actually make that problem worse -- if I know that things will cost less in a month, I'm not going to buy anything. The Fed is incentivizing spending by lowering the cost of capital to zero. By continuing this policy, they are eventually going to bring on inflation, which will reduce the value of the currency -- which gives people and companies that are sitting on money an dis-incentive to continue hoarding it.