This evergreen explainer is a guide to interpreting inflation reports, rather than a report on the latest release. The first distinction is between a price level and the speed at which it changes. Lower inflation means prices are rising more slowly. It does not, by itself, mean that a grocery basket, apartment, or train ticket has become cheaper.
Consider a deliberately simple example. A basket costs $100, rises to $110 over one year, then rises to $112.20 over the next. Its annual inflation rate has slowed from 10 percent to 2 percent, but the basket still costs $12.20 more than it did at the start. Those figures are illustrative; they are not observations from an actual inflation release. They explain why a falling rate and a stretched household budget can coexist.
In the United States, the Bureau of Labor Statistics publishes the Consumer Price Index. The CPI tracks a weighted basket of consumer goods and services, rather than following every household's personal purchases. The commonly reported CPI-U represents urban consumers. Your experience can differ because the share you spend on rent, transport, groceries, and medical care can differ from the weights in that basket.
Next, check the period being compared. A month-over-month figure compares the index with the preceding month. A year-over-year figure compares it with the same month a year earlier. They answer different questions. A sharp change twelve months ago can affect the annual comparison even if the most recent month is fairly quiet. Do not read a monthly percentage as if it were an annual one.
Look for the words seasonally adjusted. BLS uses seasonal adjustment to remove estimated recurring patterns, helping readers compare consecutive months. Its unadjusted figures retain those patterns. Adjusted data can be revised when seasonal factors are updated. A comparison is easier to interpret when you use the same series, adjustment, and time interval throughout, rather than switching between whichever numbers sound largest.
A core measure usually excludes food and energy, whose prices can be volatile. It is a way of examining underlying movement, not a suggestion that those expenses are unimportant. Read the all-items number alongside the relevant category changes. Someone facing a rent increase may need the shelter detail more than a single national headline.
Before sharing a claim, open the official release, identify the measure and comparison period, and separate percentages from index points. Write down what changed, for whom, and over how long. This small habit produces a more useful account of inflation than treating one number as a complete description of the economy or of your own finances.
Go to the sources
- BLS: Consumer Price Index questions and answers
- BLS: Seasonal adjustment in the CPI
- BLS: Current Consumer Price Index release
Our editorial standards explain how sources and automated briefings are handled.