At 20:30 Beijing time tonight, the U.S. Bureau of Labor Statistics will release August CPI. The Fed will hold its rate decision next Wednesday, making this the final piece of the inflation puzzle before the decision.

The market has been waiting for this report with great anxiety.
But this CPI will most likely not change much. Not because it is unimportant, but because no matter what it says, the answer has already been written in advance.

First, let’s look at what is on the table.
Consensus expectations: headline CPI up 0.4% month-on-month (previously 0.1%) and 3.4% year-on-year; core CPI up 0.2% month-on-month and 2.4% year-on-year.
The most striking feature of the expectations is the divergence: headline inflation is accelerating while core inflation is easing.

Why is headline inflation accelerating?
Oil prices. U.S. WTI crude broke above $100 this week, the Houthis took control of Yemen’s Mocha port, and alternative shipping routes beyond the Strait of Hormuz are also at risk. The energy component is expected to rise 2.5% month-on-month in August—gasoline and airfares are both channels through which oil prices are transmitted.

Why is core inflation easing?
Housing inflation is gradually cooling. Goldman Sachs expects primary residence rents to rise 0.23% month-on-month and owners’ equivalent rent to rise 0.22%, with the trend of moderation continuing.
The one-off price increases from tariffs are also fading.

In one sentence: input costs are rising, while domestic pressures remain stable. The inflation fire is burning outside, not at home.

Now look at the real protagonist of this report: the market has already voted first. PPI exploded last night, rising 0.4% month-on-month and 5.4% year-on-year, while July’s data was also revised higher. Inflationary pressure on the production side has been confirmed. FedWatch shows the probability of a 25-basis-point rate hike in September surging from 49% a week ago to above 73%, while the probability of another hike in December is approaching 60%.
Notice the trajectory of this number: a week ago, it was still a coin toss. Once PPI was released, the scales tipped decisively to one side.
In other words, before CPI is released, the market has already voted with its feet.

The signal from Treasury yields is even stronger.
The 10-year yield is at 4.92%, a 34-month high; the real TIPS yield is 2.52%, the highest since 2007. This is not waiting for CPI—it is pricing in “higher for longer” in advance.
So tonight’s only suspense is this: will CPI confirm the 73% pricing, or send it back down?

If it exceeds expectations, 73% could move toward 90%, making a hike next Wednesday almost certain. Pricing for consecutive hikes through December would also rise, Treasury yields would climb another step, and global risk assets would come under pressure.

If it falls short of expectations, the market will not immediately believe that inflation has surrendered—oil remains above $100, and the energy bill has yet to be included in CPI reports after September. The probability could fall back toward 60%, but that would still represent an overwhelming bias.

If it meets expectations, it would mean that nothing has happened. The 73% would hold, and the market would wait for next Wednesday.

The three scenarios all point in the same direction. That is what “cannot change much” means: oil prices have paved the road ahead, and CPI is merely stamping approval on it.

Remember? The Fed’s bloated balance sheet, $2 trillion in deficit financing, and the wave of AI infrastructure bond issuance are all being funneled into the Treasury market. Now that inflation has returned, the Fed can raise rates, but every hike pushes up the Treasury’s financing costs—10-year yields at 4.92% mean the interest bill on the $2 trillion annual deficit is still growing thicker.

Rate hikes treat inflation, but inflation’s root lies in oil prices, which the Fed cannot control.
This is a vicious cycle: do nothing, and inflation expectations become entrenched; act, and the bond market’s own side gets hurt first.
Chair Warsh said the direction of monetary policy depends on market indicators. Translated, that means acting according to the bond market’s mood. And tonight, the bond market is also watching CPI closely.

After going around in circles, everyone is waiting for a variable that no one can control—the oil tankers in the Middle East.

Three sentences for ordinary readers:
1. At 20:30 tonight, focus on core CPI rather than headline CPI.
If core CPI holds at 0.2% month-on-month, the story remains “input-driven inflation”; at 0.3% or above, price increases are beginning to seep into services, and that is a different battle.
2. Watch the dollar and gold more closely than U.S. stocks.
Rising rate-hike expectations are positive for the dollar and weigh on gold in the short term, but “higher for longer” rates mean slow blood loss for U.S. fiscal finances. The medium-term gold story is not over.
3. September 16 (next Wednesday), the FOMC meeting, is the real date.
CPI is the trailer; the decision is the main feature. A 73% probability means the market has already put down a deposit, and a reversal would incur a penalty.
The data will speak, but tonight it can only repeat what the market has already said: the inflation fire is on the oil tankers, the fire extinguisher is in the Fed’s hands, but the tankers are not under the Fed’s control.

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