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Overall CPI Inflation Is Steady While Inflation in Grocery and Restaurant Prices Increases

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This morning (January 13), the Bureau of Labor Statistics (BLS) released its report on the consumer price index (CPI) for December. The following figure compares headline CPI inflation (the blue line) and core CPI inflation (the red line). Because of the effects of the federal government shutdown, the BLS didn’t report inflation rates for October or November, so both lines show gaps for those months.

The headline inflation rate, which is measured by the percentage change in the CPI from the same month in the previous year, was 2.7 percent in December..
The core inflation rate, which excludes the prices of food and energy, was 2.6 percent in December.

Headline inflation was the same as economists surveyed by FactSet had forecast, while core inflation was slightly lower.

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. We switch from lines to bars to make the December inflation rates easier to see.

Calculated as the 1-month inflation rate, headline inflation (the blue line) was 3.8 percent in December, the same as in September which is the most recent month with data. Core inflation (the red line) was up slightly to 2.9 percent in December from 2.8 percent in September.

The 1-month and 12-month inflation rates are telling similar stories, with both measures indicating that the rate of price increase is running moderately above the Fed’s 2 percent inflation target.

Of course, it’s important not to overinterpret the data from a single month. The figure shows that the 1-month inflation rate 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.

In recent months, there have been many media reports on how consumers are concerned about declining affordability. These concerns are thought to have contributed to Zohran Mamdani’s victory in New York City mayoral race. Affordability has no exact interpretation but typically means concern about inflation in goods and services that consumers buy frequently.

Many consumers seem worried about inflation in food prices. The following figure shows 1-month inflation in the CPI category “food at home” (the blue bar)—primarily food purchased at groceries stores—and the category “food away from home” (the red bar)—primarily food purchased at restaurants. Both measures increased rapidly in December. Food at home increased 9.0 percent in December, up from 4.0 percent in September. Food away from home increased 8.7 percent in December, up from 1.7 percent in September. Again, 1-month inflation rates can be volatile, but these large increases in food prices in December may help explain the recent focus on affordability.

The news on changes in the price of gasoline was better for consumers. The following figure shows 1-month inflation in gasoline prices. In December, the price of gasoline fell by 5.3 percent after a very large 41.9 percent in November. As those values imply, 1-month inflation rates in gasoline are quite volatile.

The affordability discussion has also focused on the cost of housing. 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. The following figure shows 1-month inflation in shelter.

One-month inflation in shelter jumped in December to 5.0 percent from 2.5 percent in September, although it was down from 5.4 percent in August.

Overall, then, inflation in food and shelter was high in December, although gasoline prices fell in that month.

This CPI report is unlikely to affect the action the Federal Reserve’s policymaking Federal Open Market Committee (FOMC) may take at its next meeting on January 27–28. Investors who buy and sell federal funds futures contracts assign a very high probability to the FOMC leaving its target for the federal funds rate unchanged at that meeting as well as at its meeting on March 17–18. Investors don’t expect the committee to cut its target range for the federal funds rate until its June 16–17 meeting. (We discuss the futures market for federal funds in this blog post.)

By the time of the FOMC’s June meeting, the committee will have several additional months’ data on inflation, employment, and output. Jerome Powell’s term as Fed chair will end on May 15, so presumably the FOMC will have a new chair at that meeting. (This blog post from yesterday includes Powell’s response to the news that he is under investigation by the U.S. Department of Justice and a statement by Glenn and other economists who have served in government objecting to the investigation because they believe that it will undermine the independence of the Fed. We discuss the issue of Fed independence in Macroeconomics, Chapter 17 (Economics, Chapter 27) and Money, Banking, and the Financial System, Chapter 13.)

Inflation, Disinflation, Deflation, and Consumers’ Perceptions of Inflation

Inflation has declined, although many consumers are skeptical. What explains consumer skepticism? First we can look at what’s happened to inflation in the period since the beginning of 2015. The figure below shows inflation measured as the percentage change in the consumer price index (CPI) from the same month in the previous year. We show both so-called headline inflation, which includes the prices of all goods and services in the index, and core inflation, which excludes energy and food prices. Because energy and food prices can be volatile, most economists believe that the core inflation provides a better indication of underlying inflation.

Both measures show inflation following a similar path. The inflation rate begins increasing rapidly in the spring of 2021, reaches a peak in the summer of 2022, and declines from there. Headline CPI peaks at 8.9 percent in June 2022 and declines to 3.7 percent in August 2023. Core inflation reaches a peak of 6.6 percent in September 2022 and declines to 4.4 percent in August 2022.

As we discuss in Macroeconomics, Chapter 15, Section 15.5 (Economics, Chapter 25, Section 25.5, and Essentials of Economics, Chapter 17, Section 17.5), the Fed’s inflation target is stated in terms of the personal consumption expenditure (PCE) price index, not the CPI. The PCE includes the prices of all the goods and services included in the consumption component of GDP. Because the PCE includes the prices of more goods and services than does the CPI, it’s a broader measure of inflation. The following figure shows inflation as measured by the PCE and by the core PCE, which excludes energy and food prices.

Inflation measured using the PCE or the core PCE shows the same pattern as inflation measured using the CPI: A sharp increase in inflation in the spring of 2021, a peak in the summer of 2022, and a decline thereafter.

Although it has yet to return to the Fed’s 2 percent target, the inflation rate has clearly fallen substantially during the past year. Yet surveys of consumers show that majorities are unconvinced that inflation has been declining. A Pew Research Center poll from June found that 65 percent of respondents believe that inflation is “a very big problem,” with another 27 percent believing that inflation is “a moderately big problem.” A Gallup poll from earlier in the year found that 67 percent of respondents thought that inflation would go up, while only 29 percent thought it would go down. Perhaps not too surprisingly, another Gallup poll found that only 4 percent of respondents had a “great deal” of confidence in Federal Reserve Chair Jerome Powell, with another 32 percent having a “fair amount” of confidence. Fifty-four percent had either “only a little” confidence in Powell or “almost none.”

There are a couple of reasons why most consumers might believe that the Fed is doing worse in its fight against inflation than the data indicate. First, few people follow the data releases as carefully as economists do. As a result, there can be a lag between developments in the economy—such as declining inflation—and when most people realize that the development has occurred.

Probably more important, though, is the fact that most people think of inflation as meaning “high prices” rather than “increasing prices.” Over the past year the U.S. economy has experienced disinflation—a decline in the inflation rate. But as long as the inflation rate is positive, the price level continues to increase. Only deflation—a declining price level—would lead to prices actually falling. And an inflation rate of 3 percent to 4 percent, although considerably lower than the rates in mid-2022, is still significantly higher than the inflation rates of 2 percent or below that prevailed during most of the time since 2008.

Although, core CPI and core PCE exclude energy and food prices, many consumers judge the state of inflation by what’s happening to gasoline prices and the price of food in supermarkets. These are products that consumers buy frequently, so they are particularly aware of their prices. The figure below shows the component of the CPI that represents the prices of food consumers buy in groceries or supermarkets and prepare at home. The price of food rose rapidly beginning in the spring of 2021. Althought increases in food prices leveled off beginning in early 2023, they were still about 24 percent higher than before the pandemic.

There is a similar story with respect to gasoline prices. Although the average price of gasoline in August 2023 at $3.84 per gallon is well below its peak of nearly $5.00 per gallon in June 2022, it is still well above average gasoline prices in the years leading up to the pandemic.

Finally, the figure below shows that while percentage increases in rent are below their peak, they are still well above the increases before and immediately after the recession of 2020. (Note that rents as included in the CPI include all rents, not just rental agreements that were entered into that month. Because many rental agreements, particularly for apartments in urban areas, are for one year or more, in any given month, rents as measured in the CPI may not accurately reflect what is currently happening in rental housing markets.)

Because consumers continue to pay prices that are much higher than the prices they were paying prior to the pandemic, many consider inflation to still be a problem. Which is to say, consumers appear to frequently equate inflation with high prices, even when the inflation rate has markedly declined and prices are increasing more slowly than they were.

Would Cutting the Federal Excise Tax on Gasoline Lower the Price that Consumers Pay?

The federal government levies an excise tax of 18.4 cents per gallon of gasoline. (An excise tax is a tax that a government imposes on a particular product. In addition to the tax on gasoline, the federal government imposes excise taxes on tobacco, alcohol, airline tickets, and a few other products.) In February 2022, inflation was running at the highest level in several decades. The average retail price of gasoline across the country had risen to $3.50 per gallon from $2.60 per gallon a year earlier. The following figure shows fluctuations in the retail price of gasoline since January 2000.

Policymakers were looking for ways to lessen the effects of inflation on consumers. An article in the Wall Street Journalreported that several Democratic members of the U.S. Senate, including Mark Kelly of Arizona, Maggie Hassan of New Hampshire, and Raphael Warnock of Georgia proposed that the federal excise tax on gasoline be suspended for the remainder of 2022. The sponsors of the proposal believed that cutting the tax would reduce the price of gasoline that consumers pay at the pump. Other members of the Senate weren’t so sure, with one quoted as saying that cutting the tax was “not going to change anything” and another arguing that oil companies would receive most of the benefit of the tax cut.

Some members of Congress were opposed to suspending the gasoline tax because the revenue raised from the tax is placed in the highway trust fund, which helps to pay for federal contributions to highway building and repair and for mass transit. In that sense, the gasoline tax follows the benefits-received principle, under which people who receive benefits from a government program—in this case, highway maintenance—should help pay for the program. (We discuss the principles for evaluating taxes in Microeconomics, Chapter 17, Section 17.2 and in Economics, Chapter 17, Section 17.2) Other members of Congress were opposed to suspending the tax because they believe that the tax helps to reduce the quantity of gasoline consumed, thereby helping to slow climate change.

Focusing just on the question of the effect of suspending the tax on the retail price of gasoline, what can we conclude? The question is one of tax incidence, which looks at the actual division of the burden of a tax between buyers and sellers in a market. In other words, tax incidence looks beyond the fact that gasoline stations collect the tax and send the revenue to federal government to the issue of who actually pays the tax. As we note in Chapter 17, Section 17.3:

When the demand for a product is less elastic than supply, consumers pay the majority of the tax on the product. When the demand for a product is more elastic than supply, firms pay the majority of the tax on the product.

Consumers would receive all of the tax cut—that is, the retail price of gasoline would fall by 18.4 cents—only in the polar case where the demand for gasoline were perfectly price inelastic. Similarly, consumers would receive none of the tax cut and the price of gasoline would remain unchanged—so oil companies would receive all of the tax cut—only in the polar case where the demand for gasoline is perfectly price inelastic. (It’s a worthwhile exercise to show these two cases using demand and supply graphs.)

In the real world, we would expect to be somewhere in between these two cases, with consumers receiving some of the benefit of suspending the tax and producers receiving the remainder of the benefit. The short-run price elasticity of demand for gasoline is quite small; according to one estimate it is only −.06. The short-run price elasticity of supply of gasoline is likely to be somewhat larger than that in absolute value, which means that we would expect that consumers would receive the majority of the tax cut. (Note that we would expect the long-run price elasticities of demand and supply to both be larger for reasons we discuss in Chapter 6, Section 6.2 and 6.6.) In other words, the retail price of gasoline would fall, holding all other factors constant, but not by the full tax cut of 18.4 cents.

Joseph Doyle of MIT and Krislert Samphantharak of the University of California, San Diego studied the effect of suspension in the state excise tax on gasoline in Indiana and Illinois in 2000. In that year, Indiana suspended collecting its gasoline excise tax for 120 days and Illinois suspended its tax for 184 days. The authors estimate that consumers received about 70 percent of the tax cut in the form of lower gasoline prices. If we apply that estimate to the federal gasoline tax, then suspending the tax would lower the price of gasoline by about 12.9 cents per gallon, holding all other factors that affect the price of gasoline constant. As the above figure shows, the retail price of gasoline frequently fluctuates up and down by more than 12.9 cents, even over fairly brief periods of time. In that sense, the effect on the gasoline market of suspending the federal excise tax on gasoline would be relatively small.

Sources: Andrew Duehren and Richard Rubin, “Some Lawmakers Want to Halt Gas Tax Amid High Inflation. Others See a Gimmick,” Wall Street Journal, February 16, 2022; Tony Romm and Jeff Stein, “White House, Congressional Democrats Eye Pause of Federal Gas Tax as Prices Remain High, Election Looms,” Washington Post, February 15, 2022; Joseph J. Doyle, Jr., Krislert Samphantharak, “$2.00 Gas! Studying the Effects of a Gas Tax Moratorium,” Journal of Public Economics, Vol. 92, No.s 3-4, April 2008, pp. 869-884; and Federal Reserve Bank of St. Louis.