Global stocks fell for a third straight session as Brent crude held above $100 a barrel, with investors torn between fears of an oil-driven inflation shock and hope that central banks will look through it. Wall Street closed lower on September 9, and Asian and European shares stayed subdued on September 10 as fighting between the United States and Iran intensified around the Strait of Hormuz.
The Reuters Tankan reading and a rally in the Japanese yen did little to lift the mood. Currency markets treaded water, with the yen taking a breather after climbing to its strongest level since February, while global bond yields rose alongside oil in a pattern that leaves equity investors paying for both risks at once. Japan’s manufacturing sentiment, at its best since December 2021 on semiconductor and data center demand, showed how uneven the picture is underneath the headlines.
Oil is the whole story
Brent first crossed $100 after the latest round of US and Iranian attacks, and traders are now pricing in a longer disruption rather than a short spike. Supply through the Strait of Hormuz carries a large share of the world’s seaborne crude, so each new strike raises the question of whether exports will be constrained for weeks rather than days.
The inflation math is uncomfortable. Energy feed directly into headline CPI, and the United States gets its August consumer price reading on September 11, one trading day after this oil surge. Economists expect the print to firm. Before the latest escalation, markets were already pricing roughly a 60% chance that the Federal Reserve would raise rates at its September 15-16 meeting, an unusual stance driven by a blowout jobs report and months of sticky services inflation.
What central banks are facing
The European Central Bank also meets this week, and it faces the same dilemma in a milder form: an oil shock that raises prices while slowing growth. Cutting rates into rising inflation is hard to justify, but holding or tightening into an energy-driven slowdown risks deepening it. Neither path is clean, and Europe imports most of its energy, so the region feels a Hormuz disruption faster and harder than the United States does.
For the Fed, the timing is awkward in the extreme. A rate-hike majority built on labor data now has to digest an energy shock at the same time. If the September 11 CPI comes in hot on energy and passes some of it through to core goods, the case for a hike strengthens even as the economy loses momentum from higher fuel costs. Stocks have been voting with their feet: the S&P 500 has fallen in each session since Brent topped $100, with software and other rate-sensitive names hit hardest on September 8 and energy the main offset.
Where the risks sit
Corporate earnings are the quiet casualty. Higher crude raises input costs for airlines, chemicals, shipping and any business that moves physical goods, while higher yields compress the valuations of the technology sector that drove most of this year’s gains. Neither is priced for a sustained $100 barrel.
Bond markets tell their own story. Ten-year Treasury yields approached levels last seen two decades ago this week, reflecting both inflation expectations and heavy government supply. If energy prices keep the pressure on, the historic relationship between bond yields and equity valuations gets another stress test, and the part of the market most exposed is precisely the AI trade that carried indexes for two years.
There is a bull case buried in here. Past oil shocks from geopolitical supply scares have often retraced quickly once diplomacy or de-escalation kicked in, and any sign of US-Iran talks resuming would probably pull Brent back toward $90 fast. Traders are effectively paying a premium for headlines they cannot forecast, which is why positioning has stayed light despite three down days.
Emerging markets are the other watch point. Importers of energy in Asia face wider trade deficits and weaker currencies as dollar funding tightens, and several central banks there will have to choose between defending their exchange rates and supporting growth. That channel rarely makes Western front pages until it breaks something.
The near-term calendar is dense: August CPI on September 11, the ECB decision, and the Fed meeting on September 15-16. Until the Hormuz situation clarifies, expect range-bound, volatile trading with oil doing the steering.
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