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Yesterday's inflation report gave you two numbers. Headline inflation at 3.4%. Core inflation at 2.5%. Almost a full percentage point apart, from the same report, on the same day, describing the same economy. One of those numbers looks like a problem. The other looks close to solved. |
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Headline CPI 3.4%The full basket. Groceries, petrol, rent, insurance, airline tickets, medical care. Closest to what households actually experience. |
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Core CPI 2.5%The same basket minus food and energy. Everything else stays exactly as it was. |
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That is the entire distinction. There is no clever adjustment or complicated model. Two categories come out, and the rest stays. The reason this small difference matters so much is that food and energy are by far the most volatile pieces of the basket, and their volatility often has nothing to do with the state of the economy or the level of interest rates. |
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2 | Why the Fed Strips Out Food and Energy |
This is where new traders often get suspicious. It can look like the Fed is hiding the parts that hurt, quietly excluding the prices people complain about most in order to make inflation look tamer than it is. The actual reason is more practical, and once you see it, it makes sense. Central banks are trying to answer a specific question: is inflation embedded in the economy, or is it a passing shock? Embedded inflation, the kind that spreads through wages and services and expectations, needs higher rates. A one-off supply shock does not, because raising rates cannot produce more oil or end a drought. If the Fed reacted to every energy spike with hikes, it would be tightening into shocks it has no power to fix, then loosening again when they faded. Core exists to answer the question monetary policy can actually address: what is happening to prices that respond to demand, credit, and wages? |
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That is not a trick. It is the Fed trying to separate the part of inflation it can influence from the part it cannot. |
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3 | The July Report Is a Textbook Case |
Headline came in at 3.4% year over year, down from 3.5% in June, a second consecutive month of cooling and well off the 4.2% peak reached in May. Core came in at 2.5%, down from 2.6%. Now look at where the gap comes from. Energy prices are up 14.7% over the past year. That single category, sitting inside headline and excluded from core, is doing most of the work in that spread. Energy surged 10.9% in March alone, right after the attacks on Iran began. The interesting part is what energy did last month. It fell 1.5%, following a 5.7% drop in June. So energy is simultaneously the reason headline is still elevated annually, and the reason it is now falling month to month. That is exactly the behaviour core is designed to filter out. Meanwhile the core basket tells a calmer story. Shelter, roughly a third of the total index weight, rose just 0.1% for the second month running and sits at 3.2% annually. New vehicles rose 0.1%. Motor vehicle insurance actually fell. The main outlier was airline fares, up 2.2% on the month and a striking 25.5% over the year, which is itself partly a fuel cost story bleeding through. |
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4 | Why This Split Is Driving Fed Policy |
At the July FOMC meeting, three regional Fed presidents dissented in favour of a rate hike. That is the first time since 2016 that three policymakers lined up on one directional call, and it made the meeting genuinely contentious. Look at the two numbers and the disagreement becomes readable. If you are focused on headline at 3.4%, well above target and pushed there by an energy shock with no clean resolution, hiking looks defensible. If you are focused on core at 2.5% and falling for two straight months, hiking looks like a mistake that would tighten into an economy already slowing. The July print, arriving after that meeting, gave more support to the second camp. Traders cut the odds of a September hike almost immediately. Not because inflation is solved, but because the part of inflation the Fed can actually influence looks increasingly under control. |
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Inflation Context Every SundayEvery week, FedAndMarkets breaks down inflation data, Fed policy, and what it means for Gold, the Dollar, and five other markets. |
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It would be easy to walk away thinking core is simply the smarter number and headline is for amateurs. That is not right either, and there are three good reasons to keep watching headline. |
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1. People live in headline, not core. Households do not get to exclude petrol and groceries. Headline at 3.4% is running above wage growth of 3.2%, which means real purchasing power is still shrinking. That has consequences for consumer spending, retail sales, and eventually corporate earnings.
2. Energy leaks into core over time. Fuel is an input cost for almost everything. When energy stays elevated long enough, businesses stop absorbing the cost and pass it on. Those airline fares up 25.5% over the year are the leak in progress, and it is why the hawkish dissenters were not being unreasonable.
3. Core has its own distortions. Shelter is a third of the index and is measured with a long lag, reflecting rental conditions from six to twelve months ago. That makes core look artificially high when housing is cooling and artificially low when it is heating up. No version of this data is clean.
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6 | What Traders Should Watch |
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Check the gap, not just the levels. A wide gap, like the current 0.9 points, means headline is distorted by something the Fed will likely look past. A narrow gap means inflation is broad based, which is far more serious.
Watch the direction of both. Headline falling while core holds firm means the relief is supply driven and temporary. Core falling while headline stays high, roughly the current situation, means the underlying trend is genuinely improving. Core rising while headline falls is the warning sign.
Know which one the market is trading. Usually core drives the immediate reaction, because core drives Fed policy. But when energy dominates the narrative, as through 2026, headline surprises move markets hard too.
Follow shelter separately. It is a third of the index and heavily lagged, so it often explains why core is not falling as fast as current conditions suggest. Two months at 0.1% is a meaningful signal.
Core is the Fed's question, not the whole picture. For rate expectations, watch core. For the consumer, spending, and earnings, watch headline. They are complementary, not competing.
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Key TakeawaysCore is headline minus food and energy. The Fed uses it to separate inflation it can influence from shocks it cannot fix with rate policy. The current 0.9 point gap is almost entirely energy, up 14.7% over the year. That is why the July FOMC produced three dissents, and why the latest print cut September hike odds. Neither number is the right one. Watch the gap, watch the direction of both, and watch for the volatile part leaking into the stable part. That leak is what turns a supply shock into a policy problem. |
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The traders who read inflation well do not pick a side. They read both, watch the gap, and pay attention to whether the volatile part is leaking into the stable part. Right now core is winning the argument, and whether that holds depends almost entirely on energy. — Fed'n Markets |
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