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BIS Warns AI Spending Boom Could Flip Into a Lasting Bust

June 28, 2026 at 20:00 EDT

Infra & Chips
Policy & Regulation
Finance

The Bank for International Settlements (BIS) warned in its annual economic report published on June 28 that if Big Tech's massive AI-related investment fails to meet expectations, it could trigger a sharp contraction in financing and turn into a prolonged "investment bust" that shakes financial markets and the global economy.

June 28, 2026 · BIS Annual Economic Report

BIS Warns AI Spending Boom Is Sliding Into "Exuberance"

The world's "central bank of central banks" says the top hyperscalers' $1 trillion-plus AI capex could turn into a "protracted investment bust" if returns disappoint — drawing parallels to the railway boom and the dot-com bubble.

$1T+

Top 5 hyperscalers' AI capex, 2025–2026

$100B+

Hyperscaler bond issuance in 2025

~5%

Nasdaq's weekly drop after the report

The Scale of the AI Build-Out

Projected AI infrastructure spending, drawn to scale (US$).

$0.7T

AI infra investment, 2026

$1T+

Hyperscaler capex, 2025–26

$7.6T

Data center construction, through 2031

Cumulative data-center outlays could reach roughly 7× the hyperscalers' two-year capex.

How the Boom Could Turn to Bust

BIS flags a financing shift — from internal cash to debt — as the key fragility.

Capex surge

Spending far outstrips internal cash flow.

→

"Shadow borrowing"

Bonds & off-balance-sheet financing.

→

Returns disappoint

Financing pulled abruptly.

→

Protracted bust

Shocks to credit markets & economy.

The warning

Investment doesn't match revenue and profit growth. "Circular financing" — chipmakers and AI labs buying from each other — could amplify credit risk and echo the dot-com era.

The counterview

Survivors like Amazon and Google emerged stronger from past bubbles. Some argue correcting today's overheating is a necessary and healthy adjustment.

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