The sustainability of the AI boom is reassessed in the US stock market, with the Nasdaq experiencing its largest decline since June. On October 23rd, as investors became increasingly concerned about the unsustainable soaring spending in the field of artificial intelligence, US technology stocks plummeted sharply. The Nasdaq fell 2.6% on Thursday, marking its largest daily decline since June. At the same time, the Dow Jones Industrial Average, which is relatively concentrated in blue chip stocks, rose by 0.02%. Due to market concerns about technology companies investing heavily in the AI field, several major AI concept stocks have declined. Meta (META. O) fell 7% after the company disclosed that it will also undertake significant additional expenditure commitments in the future. Despite Meta's significant revenue growth, profits have not yet met Wall Street's expectations. Investor and analyst Navillier said, 'It all goes back to Meta.'. The problem now is that the market is selling indiscriminately, abandoning good things as well. ”Further exacerbating market concerns about AI spending, Nvidia CEO stated that AI lacks sufficient capital to support the growth of so-called 'new cloud service providers' (Neoclouds). These types of enterprises mainly provide digital infrastructure for large AI cloud computing enterprises such as Meta and Amazon. SpaceX、 Both Nvidia and CoreWeave's stock prices have experienced a decline. The Philadelphia Semiconductor Index plummeted 6.7%. Given the continued volatility in the AI sector this week, US investors are turning to the bond market for safe haven to avoid high-risk assets such as technology stocks. As funds poured into the bond market, the yield of US treasury bond bonds fell sharply.