科技股、币圈、黄金“三杀”，美股跌破关键支撑位，美国市场遭遇“全面抛售”

Market Overview - A significant sell-off swept through the U.S. financial markets on November 17, affecting nearly all asset classes, including tech stocks, cryptocurrencies, and gold, amid growing concerns over the sustainability of the AI boom and economic outlook [1][2] - The S&P 500 and Nasdaq Composite indices closed below their 50-day moving averages for the first time in 138 trading days, breaking the longest consecutive rise since May [1][5] - The Dow Jones Industrial Average experienced its worst three-day performance since April, closing down 1.2% or 557 points [1] Technology Sector Impact - The tech sector was particularly hard hit, with major stocks like Nvidia, Meta, and Amazon declining, despite Berkshire Hathaway increasing its stake in Alphabet, which saw a 3.1% rise [7] - The index tracking large tech stocks fell to its lowest closing point in nearly a month, indicating a weakening market sentiment [8][10] Credit Market Concerns - The sell-off in equities coincided with increasing pressure in the credit market, as credit spreads for investment-grade and high-yield corporate bonds widened, indicating rising concerns over corporate default risks [15][17] - Amazon's $15 billion bond issuance faced scrutiny, with the final pricing reflecting higher risk premiums, highlighting investor caution regarding tech giants' heavy borrowing for AI infrastructure [17][18] Cryptocurrency and Gold Performance - The cryptocurrency market was also severely impacted, with Bitcoin dropping below $92,000, erasing its gains for the year and forming a "death cross" technical pattern [3][22] - Gold prices fell to around $4,000 per ounce, losing its status as a safe-haven asset, while silver also dropped below the critical $50 mark [1][27] Economic Indicators and Investor Sentiment - Investor sentiment is clouded by macroeconomic uncertainties, with the Federal Reserve's policy path remaining unclear, leading to reduced expectations for a rate cut in December [26][30] - Mixed economic data, including a decline in non-residential construction spending and better-than-expected manufacturing surveys, have contributed to the cautious market outlook [28]