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A CPI Surprise: Walk Through the Chain of Reasoning

US consumer price inflation is released at 8:30 a.m. Eastern. The forecast was 3.0 percent year on year, and the actual figure is 3.3 percent. Core inflation also beat expectations by 0.1.

Build the chain, link by link. First, the surprise is positive for inflation by 0.3 points, which is large for this release. Second, higher inflation than expected raises the chance that the Federal Reserve keeps rates high or hikes. Third, higher expected US rates widen the yield gap with other countries, which tends to support the dollar. Fourth, so the first reaction is likely dollar strength, EUR/USD down.

Now test the chain against the details. If the market had priced in a rate cut for next month, the surprise could remove it, a big shift. If the market already priced hikes, the effect is smaller.

Check the components. If the rise came from energy prices, and core was soft, the Fed may look through it, and the reaction could fade. If core services rose, the concern is deeper.

Then watch the second phase: yields and the dollar often overshoot in the first minute and settle in the following half hour.

What would you do? A trader who understands the chain stays flat for the spike, then evaluates whether yields confirm the dollar move before entering.

Exercise: write the five-link chain for a weaker-than-expected employment report.

A clear chain. I would add a link about how much was already priced in, since markets often move ahead of releases. A 0.3 point beat after a week of rising yields might move the dollar less than expected. Checking positioning and recent moves before the release helps judge the size of the reaction.

The chain of reasoning is clear, and the timing matters for members here. US CPI is released at 8:30 a.m. Eastern, which is 14:30 WAT now that the US is back on standard time. During US daylight saving time, it comes out at 13:30 WAT. A 0.3 point surprise on headline CPI is large, since forecasts are usually accurate to within a tenth or two. The core beat adds weight, because central banks focus more on core inflation, which strips out volatile food and energy prices. Together they point to a strong hawkish surprise and a likely dollar rally.

Checking what was priced before the release is the most important test of the chain. If futures implied a high probability of a rate cut at the next meeting, a strong CPI print could remove most of it, causing a large repricing and a big dollar move. If futures already priced no cuts or a hike, the surprise would add less new information, and the move might be smaller. Looking at the implied probabilities for the next two or three meetings before the release gives a baseline. Comparing them a few minutes after shows how much the market's expectations actually shifted.

For the weak employment exercise I used a made up but typical case: forecast 180 thousand jobs, actual 95 thousand, the previous two months revised down by 30 thousand, and unemployment up from 4.1 to 4.3 percent. My five links: first, the labor market is clearly cooling. Second, that raises the odds of rate cuts. Third, expected US yields fall, with the two year usually moving first by something like 8 to 12 basis points. Fourth, the yield gap narrows, the dollar weakens and EUR/USD rises. Fifth, check the details, especially average hourly earnings.

That last link is where I got burned once. The headline was weak, EUR/USD rose about 25 pips in minutes, then wages came in strong, the move reversed and I was stopped out on a long I had entered on the second push.

Now I write the fifth link before the release and wait for the two year yield to agree with the dollar.

The components check is where experienced traders often find the real story. If the headline beat came mostly from energy, a central bank might treat it as temporary, especially if oil prices have already started to fall. If core services inflation, which includes rents and wages related costs, drove the beat, the concern is more persistent. Many analysts watch a measure sometimes called supercore, services excluding housing, as a gauge of underlying inflation pressure. Reading beyond the headline in the first few minutes helps judge whether the initial move is likely to hold.

The exercise of writing a chain for a weaker than expected employment report is a good one. A weak report would lower expected US rates, narrow the yield gap, and weaken the dollar, pushing EUR/USD up. The tests would be similar: what was priced, what were the revisions, and what did wages do, as the payrolls thread discusses. Building these chains before major releases helps a trader react calmly rather than chasing the first move. Has anyone here written out a chain like this before a release? I'd be interested in how often the actual reaction followed the chain you had prepared.