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The a16z Show · Wednesday, September 30, 2026

AI Fuels Unprecedented Investment Cycle, Surpassing Railroads as Percentage of GDP

The current investment cycle, driven by AI, is one of the largest in modern history, with high-tech equipment, software, and R&D accounting for 55% of US capital spending. This buildout has surpassed railroads as a percentage of GDP, and projections suggest a 20x increase in cumulative investment over the next decade.

The tape

3 quotes
“AI is driving one of the largest investment cycles in modern history.”
“So high-tech equipment, software, and R&D now account for roughly 55% of US capital spending, which is just a staggering number.”
“This build out just surpassed railroads as a percentage of GDP.”
Heard on The a16z Show — “The $1 Trillion AI Buildout | State of Markets”, published Wednesday, September 30, 2026. Heardvine summarizes and quotes with attribution and timestamps, and links to the original everywhere.
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