“The AI bubble is not sustainable,” warns economist Joseph E. Stiglitz at the Hindustan Times Leadership Summit 2026. He argues that the bubble will burst, with significant consequences linked to the US economy and its push for large data centres. Stiglitz also discusses competition among OpenAI, Anthropic and DeepSeek, saying some American companies are using lower-cost Chinese AI models to train their own systems. His remarks raise questions about the sustainability of the AI boom and the economics driving the industry.