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 - The S&P 500 index has fallen below the critical support level of 6725 points, indicating a potential risk of a 10% correction [15] - The Nasdaq and S&P 500 indices have both closed below their 50-day moving averages for the first time in 138 trading days, breaking the longest consecutive rising streak since May [3][10] - The Dow Jones Industrial Average experienced its worst three-day performance since April, closing down 1.2% or 557 points [3] Asset Performance - Gold futures have dropped to $4068.30 per ounce, with spot gold prices nearing the $4000 level [5][29] - Bitcoin has plummeted below $92,000, reversing its year-to-date gains and forming a "death cross" pattern [7][27] - The volatility index (VIX) has surged to its highest level since April, reflecting increasing investor anxiety [7] Technology Sector Impact - The technology sector has been particularly hard hit, with major tech stocks like Nvidia, Meta, and Amazon experiencing declines [12] - Despite Berkshire Hathaway increasing its stake in Alphabet, the overall sentiment in the tech sector remains weak, especially after Berkshire reduced its holdings in Apple [12] - The index tracking large tech stocks has reached its lowest closing point in nearly a month [13] Credit Market Concerns - The widening credit spreads for investment-grade and high-yield corporate bonds indicate growing investor concerns about default risks [20] - Amazon's $15 billion bond issuance faced higher pricing spreads than existing bonds, suggesting increased risk premiums demanded by investors [22] - Concerns about credit quality are spreading among AI-related companies, with rising credit default swap (CDS) spreads for firms like Oracle and CoreWeave [23][25] Macroeconomic Uncertainty - The market is facing heightened uncertainty regarding macroeconomic conditions and monetary policy, with traders reducing bets on a December rate cut by the Federal Reserve [31] - Mixed economic data, including a decline in non-residential construction spending and unexpected increases in overall construction spending, complicate the outlook for Fed policy [31] - Concerns about the private credit market have emerged, with warnings about potential "junk loans" reminiscent of the 2008 financial crisis [35]