Know what is being measured
The US Consumer Price Index measures price changes for a consumer basket. It does not measure the performance of stocks, bonds or other investment assets. A rise in the index describes consumer prices, rather than the return from an investment.
Check the series name and population covered. Differences in coverage can explain why two price measures tell different stories. The publisher’s definitions are the starting point for a meaningful comparison.
Match the comparison to the question
A change over one month and a change over twelve months answer different questions. The former helps describe recent movement; the latter compares two points a year apart. Avoid comparing percentages with different reference periods as if they were equivalent.
Also check whether the series is seasonally adjusted. Calendar effects can change a raw monthly comparison. Keep the release date, reporting month and adjustment label beside any figure you record.
Build a repeatable reading routine
Our reading checklist is simple: identify the series, note the reference period, review the main components, and distinguish reported data from your interpretation. Retain the link to the original release so that later revisions can be checked.
Inflation information can inform a discussion of household costs and monetary policy. Turning it into a market view also requires assumptions about expectations and other conditions. Those assumptions should be explicit; the report alone is not an instruction to trade.
Sources and further reading
Consult the original publisher for the latest release, definitions and schedule.
- BLS Consumer Price Index questions and answersIndex coverage, interpretation and seasonal adjustment.
- Economic CalendarDates for the next CPI publications.