BIS Warns AI Investment Race Could Turn Debt-Fueled Boom to Bust

The Bank for International Settlements (BIS) has issued a stark warning that the massive investments in artificial intelligence (AI), largely fueled by debt, are growing at an unsustainable pace and pose a significant risk of a severe bust for the global financial system. In its annual economic report, the BIS, often referred to as the central bank of central banks, stated that this investment race could surpass previous technology bubbles in scale, potentially leading to destructive market outcomes.

According to the BIS's annual report released on June 28, 2026, AI investments have surged 4.5 times their previous low in approximately three years, demonstrating faster and larger growth than any other recorded investment 'boom.' Major technology companies, including Alphabet, Amazon, Meta, Microsoft, and Oracle, are projected to spend over $1 trillion on AI-related infrastructure between 2025 and 2026. These commitments are outstripping the firms' earnings and free cash flow, compelling them to issue debt for additional financing. The bank highlighted that complex financing arrangements, such as 'circular investment' structures where semiconductor manufacturers invest in AI developers who then purchase semiconductors from the same investors, and funds channeled through non-bank entities, are amplifying these risks.

While optimism surrounding AI has contributed to mitigating cascading shocks from trade disputes and the Middle East conflict, allowing the global economy to show unexpected resilience, the BIS cautions that this resilience is fragile. Overly inflated stock valuations could suddenly collapse if interest rates rise or if AI fails to meet expectations. This scenario could result in a sharper, faster crash than traditional banking crises, potentially amplified by increased household stock holdings and a wealth effect that could trigger a sharp decline in consumption. The report suggests that a major correction in big tech stock prices could pressure technology valuations, tighten credit conditions, and slow economic growth. The concentration of AI-related stocks is notable, with the ten largest S&P 500 companies accounting for 36% to 40% of the index, surpassing dot-com era levels.

The BIS warned that the financial complexity of the AI investment boom has the potential to be as disruptive to credit markets as the 2008 global financial crisis. Specifically, AI projects funded through less regulated non-bank intermediaries like hedge funds and private credit vehicles are creating blind spots in the financial system and reducing transparency regarding risks. This lack of clarity can obscure collateral and debt ownership, creating potential 'trigger points' for contagion during crises.

These financial vulnerabilities are compounded by a broader economic and political context marked by persistent inflation, high public debt, and geopolitical tensions. Events such as conflicts in the Middle East and the closure of the Strait of Hormuz continue to generate energy supply disruptions and inflationary pressures. The BIS cautioned that such shocks could lead to higher inflation expectations becoming entrenched among households and businesses.

While analysts and market expectations remain optimistic about AI's potential for long-term productivity gains, short-term risks cannot be overlooked. BIS General Manager Pablo Hernandez De Cos emphasized the need for disciplined policymaking to safeguard price stability, restore fiscal space, and strengthen financial stability beyond the traditional banking perimeter. Should high interest rates persist or AI fail to deliver expected returns, the current investment exuberance has the potential to transform into a protracted bust.