📊 A figure that surprises, and that matters for your savings
Imagine your shopping cart growing by €6 on €1,000 in a single month. That's exactly what the latest US inflation figure says: +0.6% for the month of September. A small percentage in appearance, a real issue in practice — because this figure partly decides the price of money for everyone. And therefore, indirectly, what your savings earn.
But before looking at the figure, let's ask the question that really matters: why do markets react so strongly to a data point that most savers never read? The answer comes down to one word: surprise.
The fact: what the figure says
The CPI — the consumer price index, that is, the official measure of the rise in prices paid by American households — climbed by 0.6% for the month of September, according to published data. To put the order of magnitude in perspective: on €100 of usual spending, that represents 60 cents more in one month.
The key point is not the level, it's the gap. The "consensus," that is, the average forecast of economists, was expecting 0.2%. Result: 0.6% versus 0.2% expected. And even the "core" CPI (excluding food and energy, the most volatile items, therefore more stable and more revealing of the underlying trend) comes in at 0.3% versus 0.2% expected. Two releases in a row thus exceed the consensus.
Why insist on the gap rather than on the figure? Because markets don't react to what happens, but to what happens relative to what was expected. A high but expected figure doesn't move much. A modest but surprising figure does. That's the whole logic of the economic "surprise."
The context: a contrasting picture
This release doesn't fall into a vacuum. It arrives in an American economy sending contradictory signals — and that's precisely what complicates the reading.
- Employment is slowing: only +29K jobs created in September, versus +73K expected, and unemployment rises to 4.2% (versus 4.1% anticipated).
- But unemployment remains contained: weekly jobless claims remain low at 194K in the week of October 17, below the 200K expected, and this for several weeks in a row.
- Consumption holds up: retail sales surprise to the upside (+0.8% for the month versus +0.6% expected).
Simple translation: households continue to spend, but prices are picking up again. A delicate mix for the Fed (the Federal Reserve, the US central bank), which must arbitrate between two fires: supporting activity that is slowing, or containing prices that are accelerating.
The mechanism: how a figure transmits all the way to your portfolio
Here's the chain, link by link. Higher-than-expected inflation sustains the idea that the Fed will keep rates high for longer. Policy rates are the price of money set by the central bank: when they stay high, borrowing costs more for everyone — the government, businesses, households.
Consequence: bond yields (what the government pays to borrow) tend to rise, which often supports the dollar against the euro. But a strong dollar and high rates typically weigh on stocks, particularly on the Nasdaq, rich in technology stocks sensitive to rates. Gold, which earns no interest, also suffers when real rates (the nominal rate minus inflation) rise.
Concretely, what does that mean for you? That the price of money in the United States ultimately affects your daily life: the cost of a mortgage, the return on your savings, the value of your investments. That's the common thread of this article: macro isn't a topic for experts, it's the economy of your portfolio.
The counter-argument: don't overinterpret
Let's be honest, and this is where many go wrong. Two releases above consensus don't make a fundamental trend. Over a series of ten points, one or two statistical accidents are enough to draw a misleading slope. And an isolated figure at 0.6% can reflect volatile components — energy, food — that the Fed looks at precisely with caution.
Let's add a nuance: if employment continues to weaken, the Fed could prioritize supporting activity rather than fighting prices. In other words, the market reaction is never automatic. These are historical tendencies, not certainties. Caution is not lukewarmness: it's the condition for a fair reading.
Our reading: what really moves expectations
Let's take a clear position, on pedagogical ground. What matters is not the absolute level of the figure: it's the repetition of surprises. A single unexpected data point is noise. Two in a row is a signal that markets are starting to integrate: that of a more cautious central bank, waiting to see inflation recede before easing.
The uncomfortable truth, which must be told to beginners: most mistakes don't come from a bad figure, but from a bad reading of the gap to consensus. We look at the raw figure, we react in the heat of the moment, we forget that the market had already anticipated everything. It's one of the most classic — and most costly — traps. Reading macro means first learning to read the expectation, not just the result.
💡 Concrete case: figures and orders of magnitude
Let's take an illustrative example, purely for illustration (indicative amounts, to be verified according to your situation). Imagine a saver who places €10,000 in a remunerated vehicle at around 3% per year. Over one year, that represents about €300 in gross interest — before taxation and social contributions. If long rates stay higher for longer, this return can hold; if they recede, it can decrease. Conversely, on a €200,000 mortgage, a 0.5-point rise in rates over the life of the loan can represent several thousand euros in additional cost over the entire repayment. The same inflation figure, two opposite effects depending on whether you save or borrow. That's why it deserves your attention.
What this changes for your practice
Concretely, three reflexes to keep. First, volatility (the magnitude of price movements) around macro releases remains high: figure days are often more turbulent. Next, keep in mind that markets react to the gap to consensus, not to the raw figure. Finally, on the savings side: higher long rates can support the returns of euro funds and savings accounts, but make mortgages more expensive.
A concrete, pedagogical step: note in your journal the release dates of the CPI and the NFP (the non-farm payroll employment figures), then observe the reaction of the indices without intervening — just to learn. That's exactly the spirit of the JARVIS METHOD: a framework and tools to structure your observation, not a magic recipe. Our complete and structured training program, with bootcamps and mentoring, helps you lay these foundations step by step (Training section on the site). And to track your progress, the member area offers a trading journal (screenshots, result, mini-psych test) and a "My Trading" hub with your statistics: discipline pays more than haste.
To go further, two useful resources: our investment journal (Invest section) to track stocks, ETFs and crypto with a weekly report, and our "JARVIS Readings" to decipher economic news on a daily basis. The Telegram assistant can also send you a market brief every morning and remind you of the major events. Enough to turn each release into an opportunity to learn, rather than a source of stress.
What to remember
The trajectory drawn by FRED data (the St. Louis Fed database) is worth a look, but it's the repetition of surprises, more than the absolute level, that will move expectations. An inflation figure is not a verdict: it's a signal to be placed back in a context, to be confronted with expectations, and to be observed methodically. And you, what do you take away from this figure for your savings?
Educational content. Trading involves a risk of capital loss. This is neither investment advice nor tax advice. Past performance does not guarantee future performance.