
Image generated by GTP-4o illustrating inflation
On February 12, the Bureau of Labor Statistics (BLS) released its monthly report on the consumer price index (CPI). The following figure compares headline inflation (the blue line) and core inflation (the dotted green line).
- The headline inflation rate, which is measured by the percentage change in the CPI from the same month in the previous month, was 3.0 percent in January—up from 2.9 percent in December.
- The core inflation rate, which excludes the prices of food and energy, was 3.3 percent in January—up from 3.2 percent in December.
Headline inflation and core inflation were both above what economists surveyed had expected.

In the following figure, we look at the 1-month inflation rate for headline and core inflation—that is the annual inflation rate calculated by compounding the current month’s rate over an entire year. Calculated as the 1-month inflation rate, headline inflation (the blue line) jumped from 4.5 percent in December to 5.7 percent in January—following a large jump in inflation from November to December. Core inflation (the dotted green line) more than doubled from 2.5 percent in December to 5.5 percent in January.
Overall, considering 1-month and 12-month inflation together, today’s data are concerning. One-month headline inflation is the highest it’s been since August 2023. One-month core inflation is the highest it’s been since April 2023. This month’s CPI report reinforces the conclusion from other recent inflation reports that progress on lowering inflation appears to have stalled. So, the probability of a “no landing” outcome, with inflation remaining above the Fed’s target for an indefinite period, seems to have increased.
Of course, it’s important not to overinterpret the data from a single month. The figure shows that 1-month inflation is particularly volatile. Also note that the Fed uses the personal consumption expenditures (PCE) price index, rather than the CPI, to evaluate whether it is hitting its 2 percent annual inflation target.

As we’ve discussed in previous blog posts, Federal Reserve Chair Jerome Powell and his colleagues on the Fed’s policymaking Federal Open Market Committee (FOMC) have been closely following inflation in the price of shelter. The price of “shelter” in the CPI, as explained here, includes both rent paid for an apartment or a house and “owners’ equivalent rent of residences (OER),” which is an estimate of what a house (or apartment) would rent for if the owner were renting it out. OER is included in the CPI to account for the value of the services an owner receives from living in an apartment or house.
As the following figure shows, inflation in the price of shelter has been a significant contributor to headline inflation. The blue line shows 12-month inflation in shelter, and the green line shows 1-month inflation in shelter. Twelve-month inflation in shelter has been declining since the spring of 2023, but in January it was still relatively high at 4.4 percent. One-month inflation in shelter—which is much more volatile than 12-month inflation in shelter—rose sharply from 3.3 percent in December to 4.6 percent in January. Clearly a worrying sign given that many economists were expecting that shelter inflation would continue to slow.

To better estimate of the underlying trend in inflation, some economists look at median inflation and trimmed mean inflation.
- Median inflation is calculated by economists at the Federal Reserve Bank of Cleveland and at Ohio State University. If we listed the inflation rate in each individual good or service in the CPI, median inflation is the inflation rate of the good or service that is in the middle of the list—that is, the inflation rate in the price of the good or service that has an equal number of higher and lower inflation rates.
- Trimmed-mean inflation drops the 8 percent of goods and services with the highest inflation rates and the 8 percent of goods and services with the lowest inflation rates.
The following figure shows that 12-month trimmed-mean inflation (the blue line) jumped from 3.1 percent in December to 5.2 percent in January. Median inflation (the green line), which had been stable over the past five months, increased from 3.2 percent in December to 3.9 percent in January.

The following figure shows 1-month median and trimmed-mean inflation. One-month trimmed-mean inflation jumped from 3.1 percent in December to 5.1 percent in January. One-month median inflation rose from 3.2 percent in December to 3.9 percent in January. These data provide confirmation that (1) CPI inflation at this point is running higher than a rate that would be consistent with the Fed achieving its inflation target, and (2) that progress toward the target has slowed.

Looking at the futures market for federal funds, investors who buy and sell federal funds futures contracts are not expecting that the Fed’s policymaking Federal Open Market Committee (FOMC) will cut its target for the federal funds until this fall. (We discuss the futures market for federal funds in this blog post.) Investors assign a higher probability to the FOMC leaving its target range for the federal funds rate unchanged at 4.25 percent to 4.50 percent at its January, March, June, July, and September meetings. It’s not until the FOMC’s meeting on October 28-29 that, as shown below, investors assign a higher probability to a rate cut than to the committee leaving the rate unchanged.







































