The last letter called the September meeting a coin toss and declined to flip it. The committee flipped it, unanimously, with a quarter-point hike delivered less because the economy was overheating than because a damaged pipeline in Saudi Arabia had made the inflation outlook unrecognizable. What followed over the next ten days was a wholesale revision of nearly every forecast that mattered, and a central bank that now sets policy with one eye on the Strait of Hormuz.

Executive Summary

• The Federal Open Market Committee (FOMC) voted unanimously to raise the policy rate 25 basis points to a range of 3.75% to 4%, with the accompanying projections suggesting risk management rather than overheating as the motive.
• Damage to the East-West pipeline in Saudi Arabia, the critical alternate route for Middle East crude since the Strait of Hormuz closed, sent oil close to $110 a barrel, and forecasters now look for West Texas Intermediate to average over $100 per barrel in the fourth quarter against $80 in the first September baseline.
• Diesel at $6.50 a gallon implies an oil price of $156 a barrel, and tightness in refined products could add as much as four tenths of a point to annual core Personal Consumption Expenditures (PCE) inflation in early 2027.
• The revised baseline carries headline Consumer Price Index (CPI) inflation up to four tenths higher with core CPI a tenth higher, and projected to trim real growth to 2.1% this year and 2.4% next, each a tenth lower than at the start of the month.
• Third-quarter growth is tracking just under 4% annualized, with inventories alone contributing 1.8 percentage points and equipment spending another 0.9 point.
• Consumer sentiment fell to 48.1 in September from 51.7, with the expectations component down 10%, its largest decline since April 2025, while year-ahead inflation expectations jumped six tenths to 4.6%.
• Mortgage rates have climbed more than 30 basis points over the prior month toward 7%, and homebuilder sentiment fell three points to 32, further below the line that separates healthy conditions from poor ones.

The Fed: A Hike, and a New Reaction Function

The committee raised rates by a quarter point to a range of 3.75% to 4%, and the vote was unanimous. The accompanying projections pointed to risk management rather than an overheating economy as the motive. The proximate causes were the hotter August inflation readings and the continued climb in energy prices, which together skewed the risks toward inflation staying higher for longer, helped along by an economy resilient enough that participants lowered their unemployment projections. Several participants also raised their estimate of the neutral rate, which amounts to conceding that policy had not been as tight as they had supposed.

Chair Kevin Warsh defended the decision by naming three developments, and one of them was not an economic statistic at all: higher energy costs, a labor market that has stopped worrying him and the geopolitical flare-up in the Middle East. He again declined to offer forward guidance, though the Summary of Economic Projections said plenty on his behalf, showing almost all officials placing the risks to inflation to the upside and the risks to unemployment broadly balanced, the most hawkish arrangement in some time. A chair who refuses to tell markets what he will do has now told them something more useful, which is what he is watching. The September move will not stand alone. The second release of the September baseline pencils in another increase in December followed by an extended pause through next year, even as markets price more tightening than the committee itself projects.

The deeper change concerns how the Fed decides anything. In a world prone to adverse supply shocks, central banks will grow steadily more reactive to geopolitical stress that can unsettle inflation expectations, and the committee now appears to be done arguing over whether to look through an oil or tariff shock the way it historically would. Iran is not the only pressure point. President Donald Trump hosted Chinese leader Xi Jinping in Washington, with attention on any shift in rhetoric over Taiwan, where a genuine confrontation would amount to a global supply shock and send electronics prices higher with spillovers across the rest of the basket. Monetary policy has always responded to events. What has changed is that the events now arrive by tanker.

• Key Takeaway: The Fed hiked because the supply side moved, not because demand overheated, and it has effectively adopted a reaction function that treats geopolitical risk as a policy input. A December increase looks likely, markets are priced for more than that and the honest position is that nobody can forecast a pipeline caught in geopolitical turmoil.

Energy: The Shock That Set the Rate

One piece of infrastructure did most of this fortnight’s work. Damage to the East-West pipeline in Saudi Arabia, which had served as the critical alternate path for Middle East oil exports since the Strait of Hormuz closed, pushed crude close to $110 a barrel and will keep prices higher for longer while delaying any disinflation in import prices. This resulted in a full reworking of the September baseline, lifting the West Texas Intermediate forecast to an average of $103 a barrel in the fourth quarter from $80, with prices also higher in 2028 and 2029 on a more persistent risk premium. Risks run both ways: (1) strikes on the Ras Tanura ports and Kharg Island would take oil toward $130 in the fourth quarter, (2) on the other hand prices have already eased somewhat as Saudi Arabia found a workaround for Asian refiners and as the prospect of faster pipeline repairs took the edge off.

The more alarming price is the one nobody quotes on television. Diesel has climbed to all-time highs, and its second-round effects worry economists more than a comparable move in gasoline, because diesel sits inside the cost of producing and shipping ordinary goods and feeds directly into grocery, restaurant and delivery prices. At $6.50 a gallon, diesel implies an oil price of $156 a barrel, a gap that speaks to an extraordinary crack spread and will persist as long as tanker traffic through the Strait stays far below normal. Tightness across refined products could add as much as four tenths of a percentage point to annual core PCE inflation by early 2027. The policy response carries its own hazard: the White House floated the notion of a 90-day ban on diesel exports, which would force refiners to cut runs and push gasoline and jet fuel higher, while risking agricultural disruption in Latin America that would return home as costlier imported food.

Import prices had already turned before the latest surge showed up in any data. They rose 0.7% in August, with nonfuel prices up 0.8% accounting for the entire increase and fuel prices down a tenth for a third consecutive monthly decline, leaving the annual rate at an elevated 7%. Buried in the detail sits a reminder that energy is not the only supply story running: computer accessories rose more than 5% on the month against a 2% decline in the August CPI, a divergence that the AI infrastructure buildout should keep alive.

The forecast arithmetic follows directly. The revised baseline carries headline CPI inflation as much as four tenths higher and nudges core CPI up a tenth, with food inflation now peaking later in 2027 and at a higher rate, and the additional energy passthrough to core prices running mainly through non-energy consumer goods and airfares. Firmer prices come paired with slightly slower growth, as real output is now expected to expand 2.1% this year and 2.4% next, each tenth below the estimate at the start of the month. There is one consolation on the measurement side. The Bureau of Economic Analysis releases annual revisions that should lower measured core PCE inflation in the second quarter by two tenths, enough to ease inflation anxiety at the central bank without erasing it.

• Key Takeaway: A single damaged pipeline reset the oil forecast by more than twenty dollars a barrel and pulled the inflation profile up with it. Diesel is the variable to watch, since it travels into the price of nearly everything, and a proposed export ban would treat the symptom while worsening the disease.

Growth: Four Percent, Improbably

Set against all of that, the economy is having one of its better quarters. Third-quarter growth is tracking just under 4% annualized, a figure that owes more to arithmetic than to animal spirits. Headline retail sales rose 1.2% in August against an above-consensus estimate of 0.9%, with much of the strength found in a rebound in nonstore sales after the shifting timing of a major online shopping event distorted July, and with rising pump prices flattering gasoline station receipts; even allowing for that, gains were decent across most categories, led by food services, electronics and sports and recreation. Feeding that through Oxford Economics nowcast puts real consumer spending at a 2.8% annualized gain for the quarter, well above the 1.9% in the September baseline.

The second contributor is restocking. Business inventories rose 0.8% in July on strong gains in retail and wholesale, with the inventory-to-sales ratio down to 1.3 from near its decade average of 1.37 a year earlier, and the nowcast puts inventories alone at a 1.8 percentage point boost to third-quarter growth. The catch is that the energy shock attacks this channel directly, since higher transport and borrowing costs raise the expense of holding and financing unsold goods, and firms with heavy cross-border links to Canada, the automotive sector among them, now face markedly higher tariffs.

Equipment spending supplies the third leg and looks the most durable of the three. Durable goods orders held unchanged in August against a consensus decline of 0.3%, and the standout was a 1.6% rise in nondefense capital goods orders excluding aircraft, with solid gains across primary metals, machinery and electrical equipment, which keeps the forecast for equipment spending to expand 10.7% in 2026, the strongest annual pace in more than a decade. Shipments, which are what actually reach gross domestic product (GDP), slipped 0.2% and trimmed the tracking estimate for third-quarter equipment investment to a 16.1% annualized pace from 17.6%, still leaving equipment to contribute 0.9 points to growth. Corporate profit margins sit at all-time highs, and the AI buildout keeps broadening from information-processing equipment into machinery and metals, which is why higher financing costs have not yet bitten.

Factories supplied the one genuinely weak number. Industrial production held unchanged in August against a forecast gain of 0.4%, with the miss concentrated in manufacturing, which fell 0.3% and ended a seven-month run of increases. Motor vehicle assemblies fell more than 1% after seasonal adjustment, since the usual August rebound from summer retooling arrived smaller than in past years. The declines across primary metals, fabricated metals, computer and electronic products, aerospace and furniture read as the mirror image of July’s gains rather than a turn, and manufacturing output remains higher than a year ago, as it has for 15 consecutive months. Even so, the industrial production forecast loses a tenth this year and two tenths next year on higher rates and oil prices.

• Key Takeaway: A four-handle growth quarter built on restocking, equipment and wealth-supported spending is a real achievement and a temporary one, since two of those three legs run on cheap financing and calm supply chains. Record profit margins and an AI order book give the expansion more staying power than the headlines suggest.

Housing: Seven Percent Changes Everything

Mortgage rates have risen more than 30 basis points over the prior month and now approach 7%, which is the number that governs this entire section. Builders registered it immediately. The National Association of Home Builders (NAHB) index fell three points to 32 in September against a consensus of 34, with both current and expected sales deteriorating and respondents citing mortgage rates at their highest since May 2025, rising material costs and worsening labor shortages tied to stricter immigration policy. The backlog of completed homes for sale remains near levels last seen in mid-2009, and the share of builders cutting prices rose to 38% from 35% in August.

The construction data cut both ways in a single release. Housing starts fell 2.6% to a seasonally adjusted annual rate (SAAR) of 1.275 million, yet single-family starts rose 7.6% to 918,000, their strongest pace since March, while the volatile multifamily category sank 21.7% to 357,000. An upward revision of 70,000 to July leaves third quarter starts averaging 1.29 million, a shade under the 1.3 million estimate, with the residential investment tracker pointing to an annualized decline of about 3%. Permits, the steadier guide, slipped 2.7% to 1.39 million with declines in both categories, consistent with starts running flat to lower in coming quarters. Single-family momentum, in other words, looks like a good month rather than a turn.

Sales data were better than expected and matter less than they appear. Pending home sales edged up 0.3% in August against an estimate of a 2% decline, which points to roughly flat existing sales in September, though the forecast of about 4 million sales over the balance of the year now carries an expected markdown in October, reflecting a higher oil price profile and a second-rate increase in December. New home sales rose 6.4% to 684,000, the fastest pace of 2026, with July revised up 40,000 to 643,000, and yet the nowcast for real private residential investment still sits at negative 2.82% for the quarter.

Prices tell the affordability story without editorializing. The median new home price rose 0.4% to $393,700 in August while the annual change pushed further into negative territory at 5.8%, as the mix keeps shifting down-market. Homes priced above $600,000 have fallen to 18.7% of sales and now sit below the 20.3% share taken by homes under $300,000. When the expensive tier and the cheap tier trade places, the market is not cooling so much as reorganizing itself around who can still qualify for a loan.

• Key Takeaway: Every encouraging housing number this period arrived attached to a forecast downgrade, because rates near 7% overwhelm whatever the monthly data happen to say. Builders are discounting into a 2009-sized inventory overhang, and the sales mix is migrating toward the only buyers for which the math still works.

The Consumer, the Ballot and the Ledger

Households are spending well and feeling terrible, and the gap between those two facts keeps widening. The University of Michigan sentiment index fell to 48.1 in September from 51.7, with the damage concentrated in expectations, which plunged 10% for their largest decline since April 2025. Year-ahead inflation expectations jumped six tenths to 4.6%, their largest monthly gain in nearly six months, exceeding the 3.4% level that prevailed before the war began and fully reversing the summer’s improvement, while long-run expectations ticked up a tenth to 3.4% after three months unchanged. Headline PCE inflation now looks set to approach 4% by year end.

The spending that keeps holding up comes from a narrow place. Rising financial wealth reached a record share of household incomes in the second quarter, nearly double the share at the peak of the dot-com bubble, and most of it belongs to the top fifth of households by income, who are offsetting weakness elsewhere. Census data made the same point from the other direction: real median household income reached a record in 2025, but the top of the distribution logged a third consecutive annual increase while the bottom barely moved, and energy shocks are regressive because lower-income households spend a larger share of income on fuel.
The labor market, for its part, has gone quiet in the most reassuring way available. Initial claims fell 10,000 to 196,000 in the week ended September 12, with the four-week average at 203,250 and unadjusted claims running 22% below year-ago levels, though Labor Day timing flattered the figure, and continued claims dropped 39,000 to 1.73 million. The following week confirmed the message rather than reversing it, with initial claims down another 1,000 to 197,000 and the four-week average at 202,250. One state runs against the trend, as Hawaii saw claims rise after a category 5 hurricane, with El Nino supercharging Pacific storms. There is also a structural comfort here: research from the Boston Fed indicates the job market is far less vulnerable to energy price shocks than in prior decades. This is partly because the United States has been a net petroleum exporter since 2019, so oil-patch hiring offsets losses in importing states.

Politics and the ledger now sit closer to the macro-outlook than usual. Polling averages suggest Democrats lead in enough of the nine toss-up Senate races to take the chamber, with Texas the likely tipping-point contest, and they are expanding their generic-ballot advantage for the House. The fiscal consequences run through long yields. The baseline assumes a divided government accomplishes little beyond permanently extending the expiring tax provisions of the One Big Beautiful Bill Act (OBBBA), while upside scenarios would add one to three points to the federal debt-to-GDP ratio by fiscal 2035, and each additional point of public debt associates with a four basis point rise in the nominal 10-year Treasury yield. The war carries its own invoice, with the Congressional Budget Office (CBO) estimating that military operations in the region have cost the Pentagon about $38 billion, or 5% of its fiscal 2026 budget.

• Key Takeaway: The consumer who owns assets is carrying aggregate spending while the consumer who buys diesel is answering surveys at levels normally associated with recessions. An inflation expectation figure at 4.6% is the number that should worry the Fed most, because it is the one input a supply shock can turn into a demand problem.

Final Thoughts

The question left open two weeks ago closed the market’s way. The Fed hiked unanimously, and it hiked for a reason that has nothing to do with the textbook, namely that a damaged pipeline made the inflation outlook worse faster than any forecaster could revise it. Everything downstream followed: oil toward $110, diesel at levels implying $156 crude, inflation expectations at 4.6%, mortgage rates near 7% and a second hike now penciled in for December.

At the same time, the economy chose this moment to post its best quarter of the year, tracking just under 4% annualized on restocking, equipment spending and the households wealthy enough to ignore the price of fuel. Growth and comfort have come apart, and a central bank that now watches shipping lanes as closely as it watches wage data is the institutional acknowledgment of that. The September jobs report and the annual national accounts revisions land in the days ahead, but the variable that decides the next few months is unlikely to appear on any economic calendar.

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