Question 1

How do you read a CPI report?

Accepted Answer

Start with headline year-over-year, which is the line every wire service leads with, then immediately go to core, which strips food and energy and is the line the Fed actually cares about. Then look at shelter, because it is a third of the basket and it lags live rent data by most of a year, so today's shelter print is telling you about last year's rental market. Then glance at energy, which is where most of the month-to-month noise comes from, and food, where the split between groceries and restaurants reveals whether wage pressure is still live. The report is five numbers pretending to be one, and the order matters more than any individual line.

Question 2

What is core CPI vs headline CPI?

Accepted Answer

Headline CPI is the total change in the consumer basket, including food and energy. Core CPI takes food and energy out. Both are published at the same 8:30am ET release. The reason the distinction exists is that food and energy prices swing violently on things that have nothing to do with durable demand: an oil refinery fire, a bad wheat harvest, a Middle East flare-up. Those move the headline in a single month and often reverse the next. Core smooths past that noise and gives a cleaner read on where prices are actually going. The Fed's 2% target is usually discussed in terms of core PCE, a close cousin, and core CPI is the monthly data point markets use to anchor expectations between PCE releases.

Question 3

Why is shelter so important in CPI?

Accepted Answer

Shelter is roughly 33% of the basket. Rents and owners' equivalent rent together dominate the index, and the way BLS measures them means they lag the real-world rental market by 6 to 12 months. BLS samples leases on a rolling schedule, and a lease signed today shows up in the data only as that unit gets resampled, which can take most of a year. So when Zillow says new-lease rents have been flat for nine months, the shelter CPI number you are reading right now is still reflecting the tight market from a year ago. That lag is mechanical, not a mistake, and it is the single biggest reason shelter CPI tends to keep rising after the housing market has already turned.

Question 4

How is the CPI report released?

Accepted Answer

The Bureau of Labor Statistics publishes CPI monthly, at 8:30am ET, usually on the second Tuesday or Wednesday of the following month. The release contains headline and core year-over-year, the month-over-month change, and the full breakdown by category. Markets freeze for 15 minutes before, the release hits the wire, and bond yields, rate expectations, and equity index futures all reprice inside the first second. Traders subscribe to lock-up feeds that deliver the numbers in microseconds. The rest of us read the BLS summary, which is genuinely one of the better-written pieces of government prose and explains what moved and why in about three pages.

Question 5

What does a CPI beat mean for markets?

Accepted Answer

A hot print, CPI coming in above consensus, usually pushes Treasury yields higher, rate-cut expectations later, and stocks lower, because it means the Fed will stay tight longer and the discount rate on future cash flows just went up. A cool print does the opposite. The size of the reaction depends on where we are in the cycle: a hot core print when the market thinks the Fed is about to cut is a bigger event than the same number when the market already expects it. The first 30 seconds after the release are mostly positioning unwinds from traders who guessed wrong. The real signal shows up in the drift over the next day as the analyst community digests the subcategory breakdown.

How to read an inflation report.

The number that leads the story.

Inflation reports, answered.

How to read an inflation report.

The number that leads the story.

Inflation reports, answered.

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