美股收跌，科技股承压，中概股走弱，贵金属强劲反弹

Market Overview - The US stock market experienced a decline on Tuesday, primarily driven by a sell-off in technology stocks, leading to significant drops in the S&P 500 and Nasdaq Composite indices. Investors are becoming increasingly cautious about the returns on investments related to artificial intelligence [2][3] - The Dow Jones Industrial Average fell by 166.67 points, or 0.34%, closing at 49,240.99 points. The S&P 500 dropped by 58.63 points, or 0.84%, to 6,917.81 points, while the Nasdaq Composite decreased by 336.92 points, or 1.43%, to 23,255.19 points, nearly erasing all gains made since the beginning of the year [2][3] Technology Sector Performance - Major technology stocks faced pressure, with Nvidia down 2.84%, Microsoft down 2.87%, and Alphabet's Class A and C shares falling by 1.16% and 1.22%, respectively. Amazon saw a decline of 1.79%, while Broadcom dropped by 3.26% [3][4] - The S&P 500 technology sector fell over 2%, marking it as the worst-performing sector among the 11 major sectors. The S&P 500 software and services index has seen a continuous decline for five consecutive days, with a total drop of 12.8%, the largest five-day decline since March 2020 [5] AI Investment Sentiment - Market sentiment towards AI investments is deteriorating, with investors increasingly demanding proof of profitability to justify substantial capital expenditures. This shift is evident as Microsoft shares plummeted last week, while Meta rebounded strongly after its earnings report, indicating a growing distinction in market expectations for high investment versus high growth [4][5] - Concerns are rising regarding competition and business model disruptions in the legal, data analysis, and professional services sectors due to advancements in AI, as demonstrated by the significant stock price drops of companies like RELX and Wolters Kluwer, which fell over 10% [5] Company-Specific Developments - AMD reported better-than-expected quarterly results but provided cautious guidance for the next quarter, predicting a sequential revenue decline of about 5%, despite a year-over-year increase of approximately 32% [6] - Walmart's stock rose over 2%, driven by growth in its digital business and new customer acquisition, marking its market capitalization surpassing $1 trillion for the first time [3] Broader Economic Context - Amid the stock market pressure, US Treasury bonds attracted safe-haven buying, with the two-year Treasury yield falling by 0.2 basis points to 3.568% and the ten-year yield down by 1 basis point to 4.268% [6] - The market anticipates a delay in the Federal Reserve's next interest rate cut, now expected in June, influenced by improving economic data, although this is contingent on upcoming employment data [7]