The Fed Hikes, and the Institution Wins

The Federal Reserve raised the federal funds target range by 25 basis points Wednesday, 9/16/2026, from 3.50–3.75% to 3.75–4.00%, its first rate increase since July 2023, more than three years ago.

The vote was unanimous — which, to many, is a remarkable aspect of this release. Consensus has hardly been a defining feature of the recent FOMC, and today's decision came amid unusually intense political scrutiny of the Federal Reserve and its independence. Yet there were no dissents: governors and regional Fed presidents alike backed the rate increase. Whatever one thinks of the timing of the hike, that degree of cohesion matters. The strongest signal from the meeting may therefore be institutional rather than monetary: the Federal Reserve continues to function as an institution.

The median projection of FOMC participants point towards another 25 basis-point increase before year-end, which would take the target range to 4.00–4.25%. Beyond that, the median year-end projection suggests a pause through 2027 rather than the beginning of a prolonged hiking cycle. The message from today's meeting is, therefore, one of additional tightening, but not — at least not yet — an open-ended tightening campaign.

That path is somewhat earlier than we expected, but not meaningfully different from the direction we have anticipated since early this year. The general forecast has been for two hikes, the first in 4Q26 and the second in 1Q27. The Fed appears to be pulling that timetable forward: the move arrived a month or two ahead of our expectation, and the second one may do the same. We may have been early on the direction and slightly late on the timing.

A Supply Shock the Fed Cannot Fix

The Fed finds itself in an uncomfortable version of the stagflation quandary. Much of the latest inflation pressure originates on the supply side. The Iran war and disruption to energy markets have pushed oil and other energy prices sharply higher, while the Trump administration's import tariffs continue working their way through supply chains and, ultimately, into supermarket shopping carts. The problem for the Fed is that higher interest rates cannot produce oil, end a war, or remove a tariff.

Yet, what monetary policy can do is try to prevent those price shocks from propagating through the economy. If higher energy and imported-goods prices begin feeding into wages, inflation expectations, services, and subsequent rounds of price increases, a supply shock can become persistent inflation. That is the risk the Fed is addressing.

The problem is that monetary policy attacks that propagation primarily by suppressing demand. Do too little, and the supply shock can become embedded in broader inflation. Do too much, and the Fed weakens demand without doing anything to reverse the original shock.

That is the uncomfortable trade-off at the center of today's hike — and the reason the strength of the economy underneath the inflation numbers matters so much.

An Economy Standing on Narrower Stilts

US economic resilience increasingly appears concentrated around a few unusually strong supports. At the consumer level, higher-income households have continued to spend, supported by strong balance sheets, financial assets, and interest income, while lower-income consumers are being squeezed from both directions. Higher interest rates have raised the cost of credit-card balances, car loans, and other forms of consumer credit, while higher gasoline and diesel prices have simultaneously increased the cost of everyday consumption. The households most exposed to monetary tightening are therefore also among those most exposed to the energy shock.

Meanwhile, capital investment remains remarkably strong, increasingly supported at the margin by the extraordinary AI infrastructure build-out. Data centers, semiconductors, power generation, electrical equipment, networking, cooling, and the associated construction boom have become an important source of incremental US investment and economic growth.

That helps explain why the Fed believes the economy can absorb additional tightening, but it may also contain the seeds of the hiking cycle's eventual end.

The AI investment boom is extraordinarily capital intensive — and increasingly power constrained. During the first phase of the race, the central questions were whether companies could secure enough computing capacity and sufficient electricity quickly enough. The next phase introduces a more conventional constraint: whether the expected return on the next dollar of AI infrastructure exceeds the cost of financing it.

The transmission from higher rates to lower AI investment is unlikely to begin with cash-rich hyperscalers suddenly cancelling data centers. They can absorb higher financing costs for longer. The pressure may appear first around the edges of the ecosystem: leveraged cloud providers, data center developers, utilities, project-financed generation, and companies funding capex materially ahead of internally generated cash.

A 5%-plus Treasury yield raises the base cost of financing across that chain. Credit spreads, project-finance premia, leases, and the cost of equity sit on top of it. At the same time, political resistance to higher electricity bills is increasingly pushing more of the cost of incremental generation, transmission, and grid connections back onto data center developers and their customers.

The result is a double squeeze on project economics: the amount of capital required per project rises at the same time as the cost of that capital increases.

That matters because the marginal AI project does not need to become unprofitable for investment to slow. Its expected return merely needs to fall below the corporate hurdle rate, or below the return available from competing uses of capital. Projects that looked attractive with cheap funding and partially socialized power infrastructure can be deferred when both assumptions change.

One possible sequence therefore runs from the outside in. The most leveraged projects lose access to economical financing first. Marginal projects are delayed. Developers require stronger contractual commitments from hyperscalers. Power and infrastructure costs migrate towards the ultimate user. Eventually, even the strongest balance sheets face a higher all-in cost for incremental computing power and begin demanding clearer evidence of monetization before authorizing the next wave of capacity.

None of this requires an AI bust. A deceleration in the rate of investment is enough.

That distinction matters for the macroeconomy. GDP responds to the flow of new investment, not simply to the enormous installed stock of AI infrastructure. If AI capex goes from extraordinary growth to merely high but stable spending, its incremental contribution to economic growth falls.

And the transmission operates with a lag. Existing data centers continue to be built, contracted equipment continues to arrive, and projects already financed continue to generate construction spending. Capital-investment data can therefore remain robust for several quarters after the economics of the next investment cycle have deteriorated.

The Fed may consequently see strong investment as evidence that higher rates are not biting at precisely the moment when higher rates are beginning to bite into the projects that would have sustained future investment.

The News May Have Happened Before the News

There is another reason not to extrapolate the recent hike too far.

Financial markets had already done much of the tightening before the Fed acted. Expectations moved over the course of the year from rate cuts, to no cuts, to hikes, while the long end of the Treasury curve repriced dramatically. The 10-year yield moving above 5% matters considerably more to many long-duration investment decisions than another 25 basis points in the overnight policy rate. The rate hike announcement largely validated that repricing rather than introducing an entirely new monetary regime.

All this leaves open the possibility of some calm after the storm. Another 25 basis-point increase now appears increasingly likely to arrive sooner than our original 1Q27 forecast. But the Fed's projections do not currently describe the beginning of a long tightening campaign.

We think that distinction matters.

The Tightening Cycle May Be Self-Limiting

The Fed is effectively balancing two asymmetric risks:

(i) Do too little, and today's supply-driven inflation can propagate into persistent inflation. The path back towards 2% inflation becomes longer and more difficult.

(ii) Do too much, and monetary tightening cannot reverse the original supply shock anyway. Instead, it further squeezes consumption while increasing the cost of capital for one of the economy's most important remaining sources of investment growth.

Energy itself compounds the problem. Higher oil and gas prices are inflationary immediately, but they also operate as a tax on household purchasing power. The inflationary effect arrives first; the demand reduction follows.

Something similar happens with capital investment. Higher long-term rates do not stop construction tomorrow morning. They raise hurdle rates, weaken project economics, and gradually remove marginal projects from future capital budgets.

The Fed is therefore responding to inflationary effects that are visible today while some of the contractionary effects of those same shocks may only become visible tomorrow.

There is irony here. The Fed is hiking partly because the AI investment boom has helped make the economy strong enough to absorb higher rates. The resulting cost of capital may eventually become one of the mechanisms that brings that boom back to earth.

That is why we remain comfortable with our underlying two-hike thesis, even if the Fed appears to be pulling both moves forward. The current increase was reasonable. Another increase is increasingly probable.

The consensus is considerably less about a third.

If the AI capex super-cycle begins tapering as companies confront both the financial and physical cost of the race, the resulting slowdown in capital formation could remove one of the pillars supporting US growth. Combine that with an energy-price squeeze on consumers, and the Fed may discover that considerably more tightening has entered the economy than today's data suggest.

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