CPI (Consumer Price Index)
The Consumer Price Index, or CPI, measures how the prices of a basket of everyday goods and services change over time. The US CPI is published monthly and is one of the most closely watched inflation figures, because it shapes expectations about Federal Reserve interest rates.
How CPI works
Statistical agencies track the prices of thousands of items that households buy, such as food, rent, energy, clothing and medical care, and weight them by how much people typically spend on each. In the US, the Bureau of Labor Statistics publishes CPI each month, usually around the middle of the month for the previous month's data.
Reports show the change from the previous month and from the same month a year earlier. Analysts also watch core CPI, which leaves out food and energy because their prices swing a lot, to see the underlying trend.
Why crypto traders watch it
The Federal Reserve aims to keep inflation around 2% over time. When CPI comes in higher than expected, markets often conclude that interest rates will stay higher for longer, which tends to weigh on riskier assets. A lower-than-expected reading can have the opposite effect.
Strictly, the Fed's preferred inflation gauge is a different index, the PCE price index. CPI still moves markets because it is published earlier in the month and gets more attention.
An example
Say economists expect core CPI to rise 0.3% from the previous month, and the report shows 0.5%. Bond yields may jump and the dollar strengthen within minutes, and crypto may drop as traders adjust their rate expectations. If the report had shown 0.1%, the reaction could have been reversed. In both cases, it is the surprise relative to expectations that matters.
Limits and common mistakes
The first price move after a CPI release is often reversed within hours as markets digest the details. Data can also be revised later. Treating CPI day as a guaranteed trading opportunity is risky, because spreads widen and leveraged positions can be liquidated in either direction.
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Frequently asked questions
What does a hot CPI print mean?
It means inflation came in higher than economists expected. Markets may then expect tighter Fed policy, which has often weighed on stocks and crypto.
What is the difference between CPI and core CPI?
Headline CPI includes all items in the basket. Core CPI excludes food and energy to show the more stable underlying trend.
When is US CPI released?
Monthly, usually around the middle of the month, at 8:30 a.m. US Eastern Time. Exact dates are announced in advance and listed in economic calendars.
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