A Note On The Term Spread

Paul Krugman Conscience of a Liberal April 1, 2010

Brad DeLong reads Megan McArdle getting confused about interest rates; he’s a better man than I am. But I think there’s a bit more to say about the subject.

As many people have noticed, the term spread — the difference between short-term and long-term interest rates — is very high. The last time I wrote about this, people were taking this as proof that the economy would recover soon. Now they’re taking it as bad news — as somehow suggesting fears of default. But there’s a reason for a high term spread that has nothing to do with either explanation.

As I tried to explain last time, to a first approximation you can think of the long term rate as reflecting an average of expected future short-term rates. Short-term rates, in turn, tend to reflect the state of the economy: if the economy improves, the Fed will raise short-term rates, if the economy worsens, the Fed will cut. So long-term rates can be either above or below short rates.

Except that now they can’t. If the economy improves, short rates will rise; but if it worsens, well, they’re already zero, so there’s nowhere to go but up. This implies that there has to be a positive term spread.

Now, this spread could be fairly small if people expected the economy to remain in the dumps for a long time; see Japan. What the large spread now tells us is that the US economy is in the dumps now, but that investors see a reasonably good chance of a strong recovery in the not-too-distant future. That’s good news, not bad news.

More broadly, on the risks-of-default thing: surely if investors were growing worried about US ability to honor its debts, they would be worrying about a breakout of inflation as well as or instead of default per se. But we can track that by comparing interest rates on ordinary bonds and inflation-protected bonds. What we see is that from 3/17 to 3/30 — the period that inspired all those recent scare stories — the nominal interest rate on 10-year bonds rose by 26 basis points; the real rate rose by 28 basis points. So expected inflation actually declined, marginally.

This is not at all what you’d expect to see if markets were pricing in fears about the US ability to repay. It is, on the other hand, exactly what you’d expect to see if markets slightly upgraded their hopes of recovery.

Anyway, back to the term spread: all that huge spread is telling us is that we’re up against the zero lower bound, but that markets think we may not stay there.

Paul Krugman is an Op-Ed columnist for The New York Times.

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A Note On The Term Spread

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