Understanding the LLM Bubble
The article examines whether massive investments in large language models (LLMs) constitute a speculative bubble, arguing that the economic viability of the LLM industry hinges on unproven assumptions about rapid progress toward artificial general intelligence (AGI). It contends that current LLM technology faces structural limitations that prevent near-term productivity gains sufficient to justify trillions in spending. The boom is compared to past speculative ventures like Uber, driven more by investor narratives than sustainable business models. The convergence of corporate overinvestment, stock market overvaluation, and political enthusiasm around AI creates a uniquely risky environment.
- ▪Seven AI-focused companies accounted for 80% of U.S. stock market growth in 2025 and now represent a third of total U.S. equity value.
- ▪Data center investment linked to AI already accounts for about half of current U.S. GDP growth, surpassing consumer spending's contribution.
- ▪Nvidia dominates the LLM hardware market, selling over 90% of GPUs used in AI and reaching a $4.9 trillion valuation in 2025.
- ▪Industry leaders like Sam Altman and Dario Amodei claim AGI could be achieved by 2026–2028, justifying massive spending despite current lack of profitability.
- ▪The LLM boom rests on the belief that scaling data and compute will lead to breakthroughs, but the article argues this approach has inherent technical and economic limits.
Opening excerpt (first ~120 words) tap to expand
Spring 2026 / Volume X, Number 1 February 20, 2026 Understanding the LLM Bubble By Hubert Horan The current debate on the existence of an “AI bubble” centers on a single question: is the current high level of investment into AI data centers a massive misallocation of capital or the key to future economic growth? The companies tightly linked to generative artificial intelligence (GenAI) drove 80 percent of the stock market’s growth across much of 2025.1 The equity value of these seven companies increased by $16 trillion in the last three years and now accounts for a third of the equity value of all listed U.S. companies. Even before potential trillion-dollar capital spending increases begin, data center investment accounts for about half of current U.S.
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Excerpt limited to ~120 words for fair-use compliance. The full article is at American Affairs Journal.
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