.png "Global Insight")
The US economy expanded at a 3.4% annual rate in the third quarter of 2026, the Commerce Department reported on Thursday, October 29 — faster than expected, the fastest pace in a year, and an acceleration from 2.2% growth in the second quarter. The growth was powered by two forces that have defined this economy: an American consumer who keeps spending, and a massive buildout of artificial intelligence infrastructure.
The report landed five days before the November 3 midterm elections, and days after the Federal Reserve held interest rates steady — a combination that makes the numbers political as well as economic. Here is what drove the growth, what stayed weak, and why the headline flatters the underlying picture in one important way.
What drove the 3.4%
Consumer spending grew at a 3.8% rate from July through September, matching the solid pace of the previous quarter, with spending rising across goods including automobiles, furniture and apparel, and services including healthcare, food services and accommodation, according to reports from Business Standard via Reuters.
Business investment rose sharply, with private nonresidential investment growing at a 12.7% pace, the fastest since 2020. Investment in information processing equipment surged 37.4%, spending on software rose 9.6%, and research and development grew 7.5%. As The Fiscal Times reported, gross private domestic investment was up 19.4% overall, and real final sales to private domestic purchasers — consumer spending plus business fixed investment — rose 4.9%, up from 4.6% in the second quarter.
The AI buildout, in one number
The composition of growth points to the central role of technology spending. Companies are spending heavily on computers, peripheral equipment, chips and data centres, and that spending is now large enough to move national GDP. Imports of AI-related goods such as computer chips surged to a record high, which weighed on net exports — imports are subtracted in the GDP calculation — even as the investment itself added to growth.
Andrew Husby, a senior US economist at BNP Paribas, told Bloomberg the print shows "an economy that's performing pretty well under the surface," adding that the numbers reinforce that the economy "is supported by the AI buildout and the accompanying tailwinds, though it's not the only thing driving economic growth." That caveat matters: consumer spending contributed at least as much as investment, and government spending also rose 5.3%.
What stayed weak: housing, and households' mood
Residential investment fell 3.3%, its sixth decline in the past seven quarters, as high mortgage rates continued to squeeze home building — and as investment in data centres squeezed out housing construction in some markets. Exports declined 5.7% while imports rose 19.7%, a trade drag that forecasters had expected to be even larger.
The strangest gap in the report is between the data and the mood. The economy is expanding well above the roughly 2% pace some Federal Reserve officials regard as non-inflationary, yet consumer sentiment has deteriorated sharply and President Donald Trump's approval ratings are at record lows, according to Reuters. The Federal Reserve's preferred inflation gauge, the Personal Consumption Expenditures price index, jumped 3.6% in September from a year earlier — still far above the Fed's 2% target, and the reason the central bank held rates at 3.75–4.00%, as covered in our Fed hold explainer, while acknowledging inflation "remains elevated."
What happens next
This is the first of three estimates: revisions are scheduled for November 25 and December 23, and the advance estimate has a history of moving. Economists polled by Reuters had forecast 3.2% growth, with estimates ranging from 1.0% to 4.2% — a wide spread that reflects genuine uncertainty about how much of the AI boom is real demand and how much is inventory and import timing.
For voters heading to the midterms, the practical question is simpler: growth is strong, but it is being driven by data centres and corporate equipment orders, while housing stays weak and prices are still rising 3.6% a year. That is a good GDP report — and, for many households, not yet a good economy. The revisions, and the December Fed meeting, will show which story wins.