Twelve-Month Inflation Reads 3.7%. Six-Month Reads 4.1%.

The Two Inflation Numbers

Every recap this morning has the same two lines: the S&P gave back a third of a percent Monday, and August still finished green. Both true, and both close to useless. The last session of a month is the one where index funds rebalance and desks square books, so a third of a percent tells you about the calendar rather than the tape. Read the week instead. On the week, one part of this market moved hard and the rest of it barely registered.

Run the row from Monday’s close. The two-year finished at 4.34%, ten basis points higher across three sessions. The ten-year closed at 4.73%, the highest print since January 2025. September hike odds went from the mid thirties before Friday to the mid and high fifties depending on which venue you read. Gold gave back 0.6% to $4,591 while all of that happened. Now the other side of the row: the VIX closed at 14.92, a fifth consecutive session under fifteen, and the S&P sits within a percent of its record. Rates repriced. Equity volatility stayed where it was.

Here is the mechanism, and it is the whole edition. A twelve-month inflation figure averages a year of prints, which means it carries last autumn’s cooling inside it. The six-month annualised rate strips that out and shows what prices have been doing since spring. The chair put both on the record Friday: 3.7% on the year, 4.1% on the half. A committee deciding whether to move in two weeks looks at the second number, and the front end understood that by Friday afternoon. For a reader, this lands on the denominator. A higher policy path lifts the rate every future cash flow gets discounted at, and that shows up in index exposure and in long-duration growth names at the same moment, not in the two or three tickers on the brokerage app’s home screen. Equity vol at 14.92 is the price of insuring against exactly that, and it has not moved since the number came out.

Two reads land today: ISM manufacturing and the job-openings report at 10 a.m. Eastern. Both set temperature into the week. Broadcom reports after Wednesday’s close and the AI tape will spend Thursday arguing about it. The print that decides this edition is August payrolls, Friday, September 4 at 8:30, the last full labour read before the committee votes on the 15th and 16th. July lost 23,000 jobs and the August 28 benchmark revision erased another 79,000 from past counts. Our tripwire is the two-year. A push through 4.45% says the curve is committing to the six-month number and equity vol at fifteen becomes expensive insurance sold cheap. A slide back under 4.25% says Friday’s repricing overshot, and the tape that stayed calm was reading it correctly.