The global economy faces a looming threat: a potential ‘AI bust’ that could trigger widespread instability, according to a stark warning issued by the Bank for International Settlements (BIS). In its Annual Economic Report, released on June 28, 2026, the ‘central bank of central banks’ highlighted the unsustainable pace and concentration of AI investment, alongside persistent inflation and fiscal stress, as critical vulnerabilities that could derail global prosperity.
The BIS report paints a picture of unprecedented investment in artificial intelligence, dwarfing historical booms like 19th-century canal and railway manias. U.S. corporate AI investments have surged approximately 4.5 times their previous low in the last three years, a growth rate described as faster and larger than any other recorded investment boom. This explosion of capital, while contributing to economic resilience in the face of geopolitical and trade shocks, is now raising significant concerns about sustainability and potential financial fragility.
The Shadow of “Shadow Borrowing” and Opaque Financing
A central concern for the BIS is the opaque financing structures fueling this AI boom. “Hyperscalers” – mega-cap tech giants such as Amazon, Alphabet, Microsoft, Meta, and Oracle – are increasingly relying on debt to fund their massive AI infrastructure, particularly data centers. These companies collectively issued over $100 billion in corporate bonds in 2025. More troubling, however, is the growing use of “off-balance-sheet financing structures,” including special purpose vehicles, joint ventures, and private credit arrangements. These mechanisms obscure the true scale of leverage, creating what the BIS terms “shadow borrowing.”
This opaque financing, often channeled through less-regulated non-bank intermediaries like hedge funds and private credit vehicles, poses a heightened risk. Should the anticipated returns from AI investments fail to materialize, the BIS warns of a sudden withdrawal of funding, potentially leading to a much faster and sharper market correction than traditional banking crises. Pablo Hernández de Cos, BIS General Manager, articulated this risk, stating,
“Overly inflated stock valuations under loose financial conditions could suddenly collapse if interest rates rise or AI fails to meet expectations.”
Such a collapse could amplify the “wealth effect,” leading to a sharp decline in consumption, particularly given the increased share of stocks in household assets over decades.
The interconnectedness of the AI ecosystem – a complex web of big tech firms, semiconductor companies, AI developers, and data center builders – creates a “circular investment” structure. This intricate linkage could amplify financial risks, accelerating any market correction. The U.S. economy, in particular, has seen significant growth fueled by this AI boom, with some estimates suggesting AI data center spending accounted for nearly all U.S. economic growth in the first half of 2025. This has attracted record foreign investment, with foreign investors pouring $290 billion into U.S. stocks in the second quarter of 2025, now owning about 30% of the market, despite concerns over the U.S. public debt, which at $31.6 trillion, now exceeds the economy’s size.
Beyond the potential AI bust, the BIS report identifies broader threats to global prosperity, including persistent inflation and strained public finances. The risk of higher inflation becoming ingrained, especially in a world of more frequent negative supply shocks, remains a significant concern. Near-record high public debt and rising interest rates are straining fiscal positions globally, leaving governments with less room to maneuver in future crises. The interplay of high public debt with the increasing role of highly-leveraged hedge funds creates a “new sovereign-financial stability nexus,” posing growing risks to financial stability.
Policymakers are urged by the BIS to prioritize price stability, strengthen financial stability beyond the banking sector, ensure fiscal sustainability, and undertake structural reforms for sustainable growth. Hernández de Cos emphasized that “Policy actions must reinforce each other to avoid a pull and push on the global economy. Ultimately, success depends on sound fiscal and financial foundations.” Central banks are advised to be prepared to act if inflation expectations become unhinged, even if it means raising interest rates, and to reduce vulnerabilities before market reactions occur. The potential for an AI bust highlights the urgent need for proactive and coordinated policy responses to navigate these complex economic challenges.
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