Expected inflation is an important determinant of future inflation. If the public expects higher inflation, workers demand higher wages, prompting employers to raise the price of their goods, which results in higher actual inflation.
Markets in fixed-income securities provide timely information about inflation expectations. Treasury inflation-protected securities (TIPS) deliver interest and principal payments that are tied to inflation. Payments from regular Treasury notes, on the other hand, are not indexed to inflation. The difference between the yield rates of the two types of securities must be equal to the inflation rate expected by the markets—otherwise there would be an arbitrage opportunity. In practice, because of technical issues, the yield spread is only an approximation to expected inflation, and people call it the break-even inflation (BEI) instead. (More on this below.) From here on I use BEI and “expected inflation” interchangeably.
Because the Treasury has created notes with different maturities, we can use the spread between nominal and TIPS securities to gauge inflation expectations for different horizons. For example, today’s difference between the yield of five-year TIPS and that of five-year nominal notes is approximately equal to the inflation rate expected over the five years starting now (2008-2012).
The Fed is interested in long-term inflation expectations, because in the short term prices are affected by transitory or volatile factors, such as commodity prices. One measure of long-term expectations, which we can also derive from yields, is the five-year, five-year forward rate. That is an approximation to the rate of inflation expected for the five years starting five years from now. Today, that would be the period from 2013 through 2017.
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Chart 1 (click to enlarge)
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