美股全线下挫，科技股大跌，英伟达跌超3%，黄金涨破3340美元

Market Overview - US stock market indices experienced a decline, with the Dow Jones down 0.23%, S&P 500 down 0.84%, and Nasdaq down 1.51%, falling below 21,000 points [1] - Major tech stocks, including Nvidia and Tesla, saw declines exceeding 3%, contributing to the overall market downturn [1][2] Technology Sector - Nvidia's stock fell by 3.5%, resulting in a market capitalization loss of over $155 billion, with further declines noted on subsequent trading days [2][3] - The technology sector's performance is under scrutiny, with the "Big Seven" tech stocks being a focal point for investors, as 45% of fund managers consider "going long" on these stocks the most crowded trade [10] Economic Indicators - The US consumer price index (CPI) showed a year-over-year increase of 2.7% in July, maintaining the same growth rate as June, while the core CPI rose to 3.1%, above the Federal Reserve's 2% target [7][8] - Market expectations for a rate cut by the Federal Reserve in September are tempered, with analysts suggesting that a 50 basis point cut is unlikely [6] Investment Sentiment - Optimism in the market is reflected in revised year-end targets for the S&P 500, with Citigroup raising its target from 6,300 to 6,600 points and UBS from 5,500 to 6,100 points [9] - Despite the positive sentiment, there are warnings from investment firms about potential economic slowdowns and the risks associated with high valuations in the stock market [11]