Fed's Goolsbee Calls AI Data Center Boom 'Old-Fashioned Overheating'

Chicago Fed President Austan Goolsbee told a Leadership Greater Chicago audience on November 9, 2026, that the AI data center build-out is starting to look like "old-fashioned overheating." The Fed has not released a transcript of the moderated Q&A, so the phrase comes from reports of what he said. The comment landed on a day when markets moved sharply in opposite directions on what it means for interest rates.

Stocks rallied the same day. The S&P 500 rose 2.35 percent to 7,549.94, and the SPDR S&P 500 ETF Trust (NYSEARCA:SPY) gained 2.36 percent to $752.69. Short-term bonds moved the other way: the iShares 1-3 Year Treasury Bond ETF (NASDAQ:SHY) slipped 0.05 percent to $81.59. The two-year Treasury yield ended at 4.56 percent, and futures put the odds of a quarter-point December hike at 84 percent by the close.

The split matters for anyone holding SPY near retirement. The AI spending that raises chip stocks is the same spending a Fed official now links to inflation, and the usual fix for inflation driven by too much demand is higher rates, which tend to lower stock valuations.

What did Goolsbee actually say?

Goolsbee called employment and growth fairly stable and said inflation is the Fed's big problem. He said officials have to face up to their failure, arguing inflation was supposed to be gone by now yet is showing up in services beyond areas tied to oil and tariffs.

That distinction matters because a tariff or oil shock tends to fade on its own. Demand overheating, meaning spending that exceeds what the economy can supply, keeps going until the Fed cools it with higher rates.

He made the same case on October 13, 2026, saying the AI investment boom was pushing prices up beyond data center components and closely related industries, and that overheated demand is harder to reverse than a supply shock. He did not say which way he leans on a December hike, although he said current conditions could call for action. He has no vote on rates in 2026 but gets one in 2027, so the way he frames the problem will shape the debate over next year's rate path.

How did SPY and SHY absorb the warning?

SPY depends heavily on the AI trade. NVIDIA (NASDAQ:NVDA) made up 7.58 percent of the fund and Microsoft (NASDAQ:MSFT) 4.91 percent on its March 17, 2026 fact sheet.

The semiconductor index jumped 6.9 percent on November 9 after falling more than 12 percent the week before, and NVIDIA was its only decliner. Swings that large show how much of SPY's direction now depends on investor views of AI spending.

SHY acts differently. Its price barely moves, but a higher policy rate pushes its yield up, and the Fed already raised the upper bound of its target range to 4.00 percent from 3.75 percent in September.

Is the overheating call justified?

Richmond Fed President Tom Barkin said in prepared remarks in South Carolina that the risks lie on the inflation side and that firms are trying to pass on higher costs. He also called for officials to move carefully, and he did not blame data centers.

September CPI rose 0.6 percent on the month, and core CPI, which leaves out food and energy, rose 0.3 percent. Those readings support Goolsbee's concern, but he gave no estimate of how much AI spending adds to inflation, so his diagnosis remains a judgment call.

What does October CPI mean for the rate path?

The bond market's signal deserves more weight than the stock rally. On November 9, stocks priced in relief while short-term bonds priced in tighter policy, and the bond market's read matches what two Fed presidents said. SHY captures short-term rates that would stay high if the economy keeps overheating, and it carries little price risk if a December hike arrives.

October CPI was due November 10 at 8:30 a.m. ET. Forecasters expected a 0.3 percent monthly rise in headline prices and 0.2 percent in core. The government was set not to publish a year-over-year rate for October, but one major bank estimated 3.8 percent for headline and 2.7 percent for core.

The overheating view weakens if core CPI prints at or below 0.2 percent and December hike odds drop below roughly 80 percent before Goolsbee speaks again on November 12 at 11:15 a.m. ET. If neither happens, the market expects a hike at the December 8-9 meeting, keeping rate pressure on the AI trade that has driven chip stocks through the year.