The AI Buildout Is Now the Biggest Investment Boom in U.S. History, WSJ Reports
The biggest bet in American history
Investment in data centers, power systems, networking and specialized chips is projected to total $10.3 trillion from 2025 through 2032, an average of 3.63% of U.S. GDP per year, according to a Brookings Institution study by Columbia economist Stijn Van Nieuwerburgh. The Wall Street Journal, reporting on the study, called the artificial intelligence buildout the biggest economic bet in U.S. history.
Measured against the size of the economy, nothing else comes close. The railroad boom of 1870 to 1890 absorbed about 2.2% of GDP a year at its peak. The interstate highway system ran about 1.13%. The telecom and fiber buildout of the dot-com era was about 1.1%, electrification about 0.5% and the canal era about 0.66%.
Who is spending it
The spending is concentrated in a handful of hyperscalers: Microsoft, Meta, Alphabet, Oracle and Amazon. FactSet estimates those five companies will spend $4.2 trillion over the four years through the end of 2029, with a growing share financed through debt. Goldman Sachs estimates AI investment in the U.S. will amount to 1.9% of GDP in 2026 alone.
Van Nieuwerburgh's scenario assumes about 183 gigawatts of new data center capacity completed through 2032, against an announced and planned pipeline of 509 gigawatts. A representative 200-megawatt AI campus costs about $8.2 billion, most of it, $5.6 billion, in IT equipment rather than the building itself.
The historical warning label
The Journal's framing cuts both ways. Railroads, highways and telecom networks all transformed the country, and all three also bankrupted large numbers of the investors who financed them. A technology can change the world and still be built too expensively, too fast, a point that sits behind much of the current debate over whether AI spending can earn its cost of capital.
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How this could hit the options market
At 3.63% of GDP a year, the buildout is now a macro trade as much as a tech trade. Positioning concentrates in the spenders, MSFT, META, GOOGL, AMZN and ORCL, and in the suppliers, led by NVDA. Every capex guide from here is a market event: watch for flow around earnings-season guidance, and for credit-market spillover as more of the spend shifts to debt financing.
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