The dollar started the week at three-month lows, so how did it win the week?

Last week's wrap closed on a question we deliberately left open: the dollar was falling and a different currency won every session, so was the slide a repricing of Fed policy or a mechanical response to Treasury plumbing? We also named the tell to watch — whether one currency would finally hold the top of the table two days running (last week's wrap).

It never happened. The rotation ran all five sessions. What ended it on Friday was not a challenger taking the lead — it was the dollar itself.

Five sessions, three different leaders — CAD twice, JPY twice, GBP once — and not one of them held the top on consecutive days. Our Market Readiness Score (MRS) tells the same story from another angle: it collapsed 17 points to 41 on Wednesday and had fully retraced by Friday. The Carry Trade Score (CTS) never left the 79-80 band — 31 consecutive sessions pinned there, since 17 July. Carry conditions were the calm part of a week that was anything but.

Act I: geopolitics ran the first half

Monday opened with the dollar near three-month lows despite rising Treasury yields, and the Canadian dollar leading gainers even as trade tensions escalated (Monday's roundup). Those lows lasted two sessions.

Tuesday flipped the driver. Sanctions on Iran revived safe-haven demand, the dollar firmed, gold rallied, and the yen gained against every major except the dollar (Tuesday's roundup).

Wednesday flipped it back. Hopes of a reopening of the Strait of Hormuz pushed crude down a second consecutive session to $82, and Treasury yields fell alongside it as inflation fears eased. The yen went from strongest major to weakest in a single session, and the MRS shed those 17 points in the hours before the PCE print landed (Wednesday's roundup).

That is three sessions, three different stories, and no through-line except the absence of one.

Act II: the data took over

Wednesday afternoon is where the week turned. Headline US PCE — Personal Consumption Expenditures, the inflation gauge the Fed actually targets — came in at 3.7% against the 3.6% expected. Hawkish Fed bets revived, the dollar firmed, and gold slid away from the $4,700 ceiling that had rejected it on Tuesday at $4,697 (Thursday's roundup carries the reaction in full).

Friday morning belonged to Japan: Tokyo inflation kept a September Bank of Japan hike alive and the yen led again, while the dollar sat flat and waited (Friday's roundup).

Then it stopped waiting.

What Warsh actually said

Kevin Warsh delivered his first Jackson Hole keynote as Fed Chair at 14:00 UTC on Friday, under the title In Our Time. Three things in it moved the market.

He assigned the blame to his own institution. In his words: "The responsibility for 65 months of sustained, elevated inflation sits squarely with the central bank."

He put numbers behind it. PCE inflation at 3.7% over twelve months and 4.1% over six — accelerating, not converging on the 2% target.

He rejected forward guidance. Commitments about future rates, he argued, create ambiguity and distort markets. His framework is contemporaneous data and no promises.

What he did not do is announce, promise or date a rate hike. "A September hike is back on the table" is the market's reading of the speech, as FXStreet headlined it — the word September does not appear in the text. Investing.com went no further than "Warsh warns the Fed may not be done fighting inflation." The distinction matters, because a Chair who refuses to guide is precisely a Chair whose next meeting cannot be priced with confidence.

He was not alone — and in one case he was not even first. Forty-four minutes before the speech, Cleveland's Beth Hammack told Bloomberg it is "time for the Fed to act with rate hikes" and that waiting would create pain. Chicago's Austan Goolsbee told CNBC he agreed with Warsh and that inflation is the Fed's main issue right now.

The reaction, in the order it arrived

Those are intraday prints from the wires, not closes. The dollar was heading for a weekly gain of close to 1%.

Silver is the cleanest illustration of the day. At 07:55, hours before the speech, OCBC's Christopher Wong had flagged a resistance band at 70.60-72 with momentum fading. Silver reached $71.12 — inside the band, never through it — and was trading 3.60% lower hours later. The band held, and it took a hawkish Fed to prove it.

Gold's move has a mechanism, not a mood: a hawkish Fed crushes gold through real yields, because higher real yields raise the cost of holding an asset that pays no interest.

So what stays open?

The forward half of this week is unusually concrete, because the desks are naming meetings rather than themes.

The European Central Bank. Nomura's euro area team expects a 25 basis point hike to 2.50% at the 10 September meeting, citing higher inflation and resilient growth. BNY's Geoff Yu reads French and Spanish data as firming and frames Kazaks and Schnabel as the hawkish voices.

The Bank of Japan. Commerzbank's Volkmar Baur put the implied market probability of a September move at around 84% early on Friday, while noting the BoJ itself has given no guidance on timing.

The Reserve Bank of New Zealand. TD Securities expects +25 basis points to 2.75% in September — and is bearish the New Zealand dollar precisely because the tightening is already priced.

The Bank of England. MUFG argues that rising European natural gas prices are reviving inflation risk and could push the BoE toward another hike, underpinning the pound.

Two levels worth marking. Brown Brothers Harriman flags EUR/USD testing its 200-day moving average and USD/JPY approaching 160.00 — the level where desks have been placing the intervention risk.

And a calendar quirk. BNY notes that Monday is month-end, and rebalancing flows leave the pound exposed after a strong run.

One more note deserves quoting, because it was published hours before the speech. MUFG's Derek Halpenny wrote that Jackson Hole only becomes a significant event for the dollar when the Chair delivers a clear policy surprise or commits to future action. Warsh delivered the surprise while explicitly refusing the commitment.

How we would read it

The dollar did not win this week because it grew strong. It won because the single argument holding it down stopped being true.

For weeks the trade has been simple: everyone else is heading for the exit door marked tighter — the ECB in September, the BoJ in September, the RBNZ in September, the Bank of Korea already done — and the Fed was the one major central bank nobody placed in that camp. A currency whose central bank is the last to move loses ground by arithmetic, not sentiment. Wednesday's PCE started changing that arithmetic; on Friday the Fed Chair finished the job.

That is why the rotation ended without a winner emerging. Last week we said a rotation regime ends in one of two ways: a catalyst arrives and one counterpart takes the lead, or the move fades and the dollar retraces. It did the second, and the catalyst caused it.

The tell we set last week has not fired yet, and it still stands: watch whether one currency holds the top of the table two consecutive sessions. Until it does, treat any single day's strength as temporary — our Forex Strength Index (FSI) exists to surface exactly that shift. Add two price levels to the watchlist: gold's $4,700 ceiling, tested once and still unbeaten after Tuesday's rejection at $4,697, and USD/JPY at 160.00.

And one longer fuse, now that the Fed is a live political question again: the US midterm elections in November, where a divided government is the scenario most likely to reprice the dollar.

Update — 4 September. The tell above fired on Monday: the yen held the top of the table on Friday the 28th and again on the 31st, the first back-to-back leader since at least 10 August. Gold's $4,700 ceiling was long gone by then — the week traded a $4,282-$4,500 range instead — and USD/JPY never tested 160.00 from below: suspected intervention pushed it away from the level and it ended the week near 155.85, with BNY now reading 160 as a deterrent rather than a target. Payrolls came in at nearly three times the forecast, so why did the dollar still lose the week?