The dollar index printed 99.16 and the ex-US discount stayed open

A weak dollar is supposed to be the week the basket works. The week of 17 to 21 August printed the condition. The dollar index fell 0.87%. The euro rose 0.9%. Sterling rose 0.75%. The basket did not. Hang Seng +3.6%. FTSE 100 +0.6%. Euro Stoxx 50 -1.2%. Nikkei 225 -3.9%, closing Friday at 66,016. Four regions, four signs. That is dispersion, not a bid for ex-US.

On a longer clock, the discount has one necessary condition for closing, and that condition is a weak dollar. Without it, you earn the valuation gap in local currency and give it back in FX. A weak dollar is necessary. The week showed it is not sufficient. The market priced regions on their own merits, not as a sleeve.

A discount is not a basket

Heart of Midlothian's August 2026 cut is the honest recent one. Europe trades at about a 26% forward discount to the S&P 500, the narrowest in four years and in line with the ten-year average, after Europe outperformed the S&P by 18.9% in dollars in 2025. In 2024 the Stoxx 600 discount was nearer 40%, among the widest in three decades. The gap narrowed because Europe re-rated and because US multiples compressed. On a PEG basis they still prefer the S&P. Say which gap you mean.

Swissquote, 19 August, citing a Goldman chart: US 12-month forward P/E including and excluding Big Tech sits near the top of its two-decade range, around 21.2 times for the tech-heavy US sheet. Emerging-market stocks around 10.5 times, below their own historical range. Japan is the awkward middle. Hennessy's recent TOPIX cut is 16.2 times 2026 forward earnings, about 14% below the US, and 1.8 times book, a third below the developed-market average and more than two-thirds below the US. TOPIX earnings yield about 5.9% against a 10-year JGB near 2.9%. Those are index-provider and house numbers.

The 31 July 2026 MSCI USA versus EAFE forward gap is 20.37 minus 15.53, 4.8 points. An IT-weight adjustment leaves 4.3 points, 88% of the headline. The remaining ten sector forward P/Es from the same month's sheets are not on disk. Until they are, 4.3 is the honest cut. If a full sector mix later collapses that gap, most of cheap-ex-US was Tech weight. If it stays large, the discount is geographic. Comparisons that do not sector-adjust compare a Tech index to a bank-and-industrial index and call the difference a bargain.

Japan is the exposed close

The Nikkei's 3.9% week was local. Japanese long-term yields tagged levels not seen in roughly thirty years. The 10-year JGB was near 2.88% on Friday. The 30-year was near 4.06%. Inflation accelerated for a second month. The Bank of Japan's policy rate is already 1%, a 31-year high, and the next meeting is 17 to 18 September. Markets have been leaning toward another quarter point. The yen sat near 159 per dollar. SoftBank, Taiyo Yuden, and Fujikura led the Friday fade. Tokyo CPI on 28 August is an input to September, not a reason to invent an ex-US basket bid.

A weak dollar did not save a market that was discounting a domestic hike and a 30-year yield at a generation high. That is the second half of the claim. SoftBank is a fact about one Friday in Tokyo. It is not a verdict on Europe's 26% discount.

Do not treat four regional closes as one position. Do not use a year-to-date flat dollar to dismiss a five-session drop. Do not promote one week of the Hang Seng into a re-rating of the gap.

The UK and Europe are not the same trade

FTSE up 0.6% on a gold-and-oil week is index composition. The UK index has energy and miners. A real-asset week against the currency will lift it without anyone having made a UK call. Euro Stoxx down 1.2% in the same dollar-down week is the other half of the same lesson. Defence, electrification, and an industrial surprise index at a three-and-a-half-year high, the Ledger Asia cut from early August, can be true in a week Europe finished down.

Hong Kong's +3.6% is the one region that looked like a bid. Do not promote it to a thesis. One week of the Hang Seng is not a re-rating of the ex-US gap. It is one close.

What a weak-dollar week cannot do

A falling dollar is the short truth. It will be quoted as a refutation of cheap-for-a-reason. It is not. A refutation would look like this: the US versus ex-US forward gap narrows by three points while the dollar stays above its 200-day average; or the dollar spends sixty sessions at least 4% below that average and the gap barely moves; or ex-US earnings revisions stay worse than US revisions for four quarters while the dollar softens. A Friday in four indexes is none of those.

The tradeable form is unhedged against hedged. EFA versus HEFA. Unhedged should win when the dollar falls, by more than the carry you gave up to take the currency. If it does not, the mechanism is wrong even if the gap later narrows for some other reason. The year-end window starts from the 22 August close. No session in that window has printed yet. Do not read the trailing sixty-session spread as that result.

The Ledger Asia piece from 6 August is the mood music. US exceptionalism less exceptional. Europe and Japan surprise indices up. The dollar broadly unchanged on the year against developed peers. A year-to-date flat dollar and a one-week 0.9% drop are different objects. The first is why US multinationals have not been living on a translation windfall in 2026. The second is the condition. Do not use the year-to-date line to dismiss the week, and do not use the week to declare a cycle.

Emerging markets at about 10.5 times on the Goldman and Swissquote sheet are the widest gap and the least like a basket. A soft dollar helps some of them and blows up others. Adding EM to the average would make the slogan worse, not better.

Warsh's Friday keynote can move the dollar. Jackson Hole and Tokyo CPI can move DXY and the yen on the same Friday. Where the dollar and the four regions close is the observation. The average is not.

Anyone still running ex-US value as a single position should be uncomfortable. The condition printed. The basket did not. Hong Kong, or the UK on a commodity day, or Japan after a Bank of Japan pause, might be trades. Ex-US this week was a slogan.