中概股下挫，小马智行跌近7%，阿里跌超3%，加密货币超24万人爆仓

Group 1: Market Overview - The US stock market experienced a sudden shift, with all three major indices declining: Dow Jones down 0.23%, S&P 500 down 0.99%, and Nasdaq down 1.57%, ending a streak of record highs [1] - Concerns over poor earnings and fears of an AI bubble led to significant declines in several large tech stocks, including Meta down 11.33% and Microsoft down 2.9% [2] Group 2: Individual Stock Performance - eBay's stock plummeted nearly 16%, marking its largest drop since 2008, due to Q4 earnings guidance falling short of expectations [2] - The Philadelphia Semiconductor Index fell 1.53%, with 22 out of 30 component stocks declining, including AMD down 3.59% and Broadcom down 2.46% [2] Group 3: Cryptocurrency and Gold Market - Cryptocurrency stocks faced a collective downturn, with notable declines such as Canaan down over 7% and Coinbase down over 3% [6] - The cryptocurrency market saw significant sell-offs, with over 24,400 individuals liquidated, totaling nearly $1.1 billion [6] - Gold prices surged, closing up 2.44% and surpassing $4,000, as market risk aversion increased [6] Group 4: AI Bubble Concerns - The enthusiasm for AI has driven much of the stock market's gains since October 2022, but there are concerns about the sustainability of this trend [9] - Analysts warn of potential bubble risks associated with AI, suggesting that investors may be prematurely pricing in its positive impacts [10] - Historical valuation metrics indicate that the S&P 500 may be overvalued, raising concerns about a potential market downturn despite apparent strong growth [10]