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Has the AI boom entered a manic new phase? | The Economist

Henry Curr, Mike Bird, Josh Roberts

US equity markets have reached near-record capitalization levels driven primarily by massive AI-focused "giga IPOs" like SpaceX and anticipated offerings from Anthropic and OpenAI. This concentration, now comprising nearly 40% of the S&P 500, coincides with unusual retail participation and inverted options pricing that signal a shift toward speculative mania. Simultaneously, major technology firms have redirected capital expenditure toward infrastructure, causing a collapse in free cash flow and transforming the sector into a dominant force in global corporate debt markets.