BIS Sounds the Alarm: $1 Trillion AI Boom, Record Public Debt, and a New Financial Stability Nexus

AI Investment Boom: Sharper Than Past Bubbles

The BIS cautioned that the current AI-driven investment surge is sharper than past "bubble" periods, with intense competition for market leadership, supply bottlenecks, and the risk of over-investment mirroring patterns seen in previous innovation-driven boom-and-bust cycles .

Major U.S. hyperscalers — the five leading cloud computing firms — are projected to invest over $1 trillion in AI infrastructure through 2026, a scale the BIS says could turn into a damaging and prolonged "investment bust" if earnings expectations are not met .

Crucially, equity prices have run far ahead of debt market pricing, underscoring the fragility of the boom's financing . Much of this spending is shifting from operating cash flows to debt, with funding increasingly funnelled through loosely regulated private credit channels and hedge funds, creating blind spots for regulators .

The report flagged "complex interactions within the AI supply chain" and circular investment structures among tech firms, where interconnected financing among AI companies, suppliers, and investors could rapidly amplify losses in a downturn .

An AI stock correction could trigger a broader wealth-effect decline in consumption, as stretched asset valuations unwind and squeeze household balance sheets . The BIS noted that the rapid shift of financial intermediation from banks to non-bank financial institutions (NBFIs) means an AI downturn could unwind far more rapidly and sharply than previous banking crises .

Record-High Public Debt and the 'Sovereign-Financial Stability Nexus'

Near-record-high public debt levels in major economies have created what the BIS calls a new "sovereign-financial stability nexus" . The interplay of high sovereign debt with the expanding role of highly leveraged hedge funds in sovereign bond markets poses growing financial stability risks .

Liquidity in core bond markets has become more fragile, and leveraged non-bank intermediaries could amplify and accelerate sharp drops in sovereign bond values, quickly tightening financial conditions and complicating central bank policy .

The BIS warned that government bond markets are now a potential source of stress rather than a shock absorber, with high debt levels and greater rollover risks potentially accelerating the rise in bond yields .

Non-Bank Intermediaries and Financial Fragility

The report highlighted that oversight of non-bank channels is insufficient, leaving the system exposed to sudden redemptions and forced selling . The rapid growth of private credit, hedge fund leverage, and AI-financing channels creates significant data and regulatory gaps .

The BIS cautioned that leveraged non-bank intermediaries, acting through opaque channels, could trigger flash crashes that traditional banking safeguards are not designed to handle .

BIS Call for Urgent Policy Action

The BIS urged policymakers to act now on four fronts :

1. Price stability — ensure inflation expectations remain anchored, especially after the recent Strait of Hormuz supply shock and renewed inflation risks .
2. Fiscal sustainability — reduce high debt levels to restore government capacity to respond to future crises .
3. Strengthen oversight beyond the banking perimeter — regulate non-bank intermediaries and close data gaps in private credit, hedge fund leverage, and AI-financing channels .
4. Structural reforms — pursue long-term productivity and growth reforms to support sustainable adjustment .

BIS General Manager Pablo Hernández de Cos warned that delay would only make future adjustments more costly and increase the chance of difficult trade-offs .