Standfirst: Concerns about Nvidia’s leadership change, the sustainability of the artificial intelligence investment boom and rising US debt shaped discussions on the final day of Web Summit in Lisbon. Market commentators said the risks were serious, but stopped short of predicting an immediate repeat of the 2008 financial crisis.
Questions about the AI bubble and the stability of global financial markets took centre stage at Web Summit in Lisbon on Thursday, as speakers examined whether soaring investment in computing infrastructure and mounting public debt could create vulnerabilities for the world economy.
The discussion followed Nvidia’s announcement that Jensen Huang had stepped down as chief executive. Chief financial officer Colette Kress was appointed interim CEO while the company’s board searches for a permanent successor. The leadership change added a fresh layer of uncertainty to an already closely watched technology sector.
AI bubble concerns intensify after Nvidia leadership change
Adam Kobeissi, founder and editor-in-chief of The Kobeissi Letter, said Huang’s departure was likely to be negative for Nvidia investors in the short to medium term, although he remained positive about the company’s broader prospects.
Nvidia shares fell sharply at the start of trading following the announcement before recovering some ground. The movement reflected investor concern about the importance of Huang’s leadership to the chipmaker’s strategy and its position at the centre of the artificial intelligence boom.
The company is one of several major technology businesses that have agreed to buy shares in Anthropic, the AI company behind Claude. The planned market debut is expected to attract significant attention because of the scale of the valuation being sought.
Kobeissi said Huang’s exit was unlikely to affect Anthropic’s planned offering. However, the episode highlighted how sensitive financial markets have become to leadership changes at companies regarded as central to the AI investment cycle.
Could Chinese technology challenge US dominance?
Economist James Galbraith, a professor at the University of Texas at Austin, said Chinese technology could eventually become competitive enough to undercut Nvidia’s position. That possibility would raise broader questions about the hundreds of billions of dollars being committed by major US technology companies to data centres, advanced chips and other AI infrastructure.
Galbraith described the competition between the United States and China as a contest between different economic and political systems. The US can mobilise private capital quickly, but policy decisions may take longer. China, by contrast, can coordinate research, industrial policy and deployment more centrally.
On that basis, Galbraith said he would tentatively favour China in the long-term AI competition and suggested that China could become the world’s largest economy over the coming decades. His comments were presented as an economic assessment rather than a prediction of an immediate change in global technology leadership.
US debt raises concerns about future financial stability
The panel also focused on the condition of US public finances. Kobeissi pointed to the growing share of government revenue being used to service federal debt rather than reduce the amount owed.
According to US Treasury figures cited during the discussion, net interest payments reached approximately $1.1 trillion in the fiscal year ending in September, equivalent to around 19% of federal revenue. The figures have renewed debate about whether high borrowing costs could limit the government’s ability to respond to a future economic shock.
Kobeissi argued that debt markets were signalling a “higher for longer” environment, in which interest rates remain elevated for an extended period. He described the long-term trajectory as highly concerning, while also saying that the United States remained economically resilient and a major centre of innovation.
He did not describe the current situation as an imminent repeat of the 2008 financial crisis. Instead, he warned that the combination of high debt, interest costs and political divisions could become more difficult to manage over the next decade or two.
Why political cooperation matters
Galbraith recalled the cooperation between the Trump administration and a Democratic-controlled House during the COVID-19 pandemic, when lawmakers approved measures designed to support financial markets and the wider economy.
He questioned whether a comparable degree of political cohesion would be available during a future crisis. The ability of governments and central banks to respond quickly is often crucial when financial markets come under severe pressure, particularly if borrowing costs are already high.
The discussion also touched on the US midterm elections. At the time of the panel, several races remained unresolved and ballot counting was continuing in some states. The speakers treated the political landscape as an important factor in assessing the government’s capacity to address debt and economic risks.
Storm disruption and the final day of Web Summit
The debate took place on the final day of Web Summit in Lisbon. The previous day’s programme had been cancelled on the advice of the Portuguese authorities, who had declared a state of emergency ahead of Storm Charles.
The storm ultimately caused heavy rain and minor flooding in Lisbon but did not produce the severe disruption that had been feared. The final day brought together discussions on technology, markets and global economic policy, with the Nvidia leadership change and financial stability emerging as major themes.
What the discussion means for Europe
Although the panel focused largely on the United States and China, its themes are relevant to Europe’s economic and technology policy. European companies and governments are also investing in AI infrastructure, while financial conditions in the US can affect global borrowing costs, equity markets and technology valuations.
The debate does not establish that an AI bubble will burst or that a financial crisis is imminent. It does, however, underline the importance of assessing whether investment in artificial intelligence is supported by sustainable revenues, productivity gains and manageable financing costs.
For European policymakers, the discussion also reinforces the significance of technological competitiveness, access to advanced computing and resilience in global supply chains. These issues are central to EU debates about industrial strategy, digital regulation and economic security.
Conclusion
The final day of Web Summit brought together two connected concerns: whether the AI investment boom has moved ahead of its economic foundations, and whether rising US debt could restrict the response to a future shock. The speakers did not forecast an immediate financial crisis, but their warnings suggest that technology valuations, public borrowing and geopolitical competition will remain closely linked in the years ahead.