Cowen’s Third Law used to read "All propositions about real interest rates are wrong," so I hesitate to tread on this ground. The question is, when inflation comes, why doesn’t the expectation of that inflation lead to proportional increases in nominal interest rates, thus keeping the real rate constant? The studies I’ve seen all indicate a less than one-to-one Fisher effect. I can think of a few hypotheses:
1. People systematically underestimate the forthcoming rate of price inflation. (Still?)
2. People have generally adaptive expectations, but they will adjust quickly and rationally to big enough jolts. And maybe inflation rises slowly, but deflations come all of a sudden. So it seems there are more periods when people’s expectations are lagging an inflation than a deflation, and that will produce the data pattern stated above.
3. People have generally rational expectations in a game against nature, but they are playing a game against the Fed. The Fed is smarter than the people. And the Fed has studied Newcomb’s Paradox so it can, on average, figure out when a dose of inflation will surprise people (in a positive way, of course, socially speaking). So every now and then we get these surprise bursts of inflation, but no comparable surprise bursts of deflation, which of course would not help output any. In this set-up the Fisher effect won’t fully hold.
4. A Mundell-Tobin effect is operating, so real rates of return are falling because the inflation moves people out of currency and into capital.
5. The new money enters through the loanable funds market, thereby depressing real interest rates.
6. Sometimes things just don’t work out the way you think they ought to.
Once you consider the tax system, you realize how much the cards are stacked against our attempt to explain this. Many people can deduct their nominal interest payments from their taxes, and that implies we should see a more than one-to-one Fisher effect from inflation. But we don’t.
You’ll also note that under most of these explanations the specified dose of inflation does not have a significantly negative effect on private savings. If the inflation is expected, the nominal interest rate adjusts. If the inflation is not expected, it doesn’t scare off savings.
Do you have other ideas? I believe the incomplete Fisher effect is a result which holds both across time and across countries, but maybe you know the latest paper which I don’t.
People don’t expect the inflation to continue, which is betting on a political result.
At the long term end, when that happens, your bonds rise in value, producing a payoff.
What are the two first laws?
Apeman makes a good point, when the church bells in Puebla woke me up at 5 a.m. I realized: “I forget to mention the loanable funds channel!” Sadly the computer was in Yana’s room at the time. I added it to the list.
Tyler, there is evidence to support the Fisher effect. See Atkins and Coe (2002, Journal of Macro), Shome et al (1988, Journal of Finance).
The crucial thing is that you have to take into account the risk premium when there is uncertainty. This could be derived from a model such as Lucas’ (1978 Econometrica).
Obviously, results will depend on the methodology used, but answering your question: evidence in favour of the Fisher effect does exist.
Two stories. First, who said real interest rates are constant? Inflation shows persistent comovements over the business cycle, and so does productivity. Second, risk premia play a far more important role than we have considered so far.
In order to make the appropriate analogy, let us consider the typical day of a stock:
(a) Most of the time it tricks up.
(b) Once in a while it crashes down.
When it trickles, it is beating expectations, just like how people “underestimate” price inflation.
It’s not that people “underestimate” price inflation in the sense of expected value, it’s just that the way we weight (a) and (b) means that so long as (b) is not happening, it appears that we are underestimating (a). Our genuinely rational weighting of (b) provides the illusion while (b) is absent.
While this may appear to be “systemic”, it is simply “good math” [that makes us wobble as we walk down the hallway].
With regard to the theory that real interest rates don’t significantly affect the savings rate, has anyone noticed that the US national savings rate is zero?
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