March 5, 2010, 11:23 AM
Earlier this week I gave a talk about the state of the crisis at Princeton’s Plasma Physics Lab, and one audience member asked a really good question: if the problem is that interest rates are at the zero lower bound, why should we worry about government borrowing? After all, doesn’t that mean that the government can borrow at a zero rate?
Now, part of the answer is that you really don’t want governments financing themselves largely with very short-term debt — that makes them too vulnerable to liquidity crises. But even long-term rates are low — the real interest rate on 10-year bonds is below 1.5 percent.