July Consumer Prices Need Two Columns: Monthly Change and Annual Level

A Consumer Price Index report gives readers at least two important measures: the change from the previous month and the change over the previous 12 months. They are related, but they are not the same statistic. The monthly figure describes the latest movement in the index, often presented on a seasonally adjusted basis. The 12-month figure compares the current index with the same month a year earlier. A responsible July CPI account needs both columns.

The Bureau of Labor Statistics publishes the release, tables and methodology that define the measures. That source is more useful than a single social-media graphic because it shows the series, adjustment basis and component categories. A small monthly change does not by itself establish the annual inflation rate, and a 12-month figure does not reveal whether the most recent month moved up, down or held steady. Reporting only one can create a true but incomplete impression.

Category changes also require care. Food, energy, shelter and core measures can move differently, and a headline about one component may not describe the all-items index. Seasonal adjustment can change how month-to-month comparisons are interpreted. Neither adjustment nor a multi-month average is a trick; each is a defined statistical tool. The fair question is which measure a claim is using and whether the source labels it accurately.

Warren Bullion’s check is therefore a two-column discipline: cite the BLS release, label the monthly and 12-month measures separately, and identify whether the change is seasonally adjusted. The July report should inform readers about both the current month and the broader annual level. It should not be used to smuggle one conclusion into the other.

The same method helps with comparisons to wages, interest rates or household budgets. CPI is a price index, not a direct measure of every family’s expenses or of individual purchasing power. Those broader questions may require additional data. The release is still indispensable because it provides the common baseline for the price change it measures. The correct use is specific: identify the series, period and adjustment, then explain what the number does—and does not—represent.

The Bureau of Labor Statistics is the primary source for the CPI series and definitions. Claims about a particular release should link to the release tables or methodology, so readers can see whether a number is monthly, annual, adjusted, unadjusted, all-items or a component measure. That transparency is particularly important when policy arguments cite the index.