美股大跌后又强劲反弹，投资者更紧张了

Core Viewpoint - The U.S. stock market continues to rebound, with the Nasdaq 100 index surpassing the 100-day moving average, but concerns about AI investment returns persist amid weak employment data, increasing uncertainty [1][3]. Group 1: Market Performance - On Monday, the U.S. stock market extended its rebound from the previous Friday, with the S&P 500 index approaching historical highs and the Nasdaq 100 index closing up 0.8% [1]. - The Dow Jones Industrial Average surged over 1200 points last Friday, breaking the 50,000-point mark for the first time, as investors viewed last week's sell-off as an "overreaction" and a buying opportunity [3]. - The technology sector led the rebound, with significant gains in previously battered software and chip stocks, including Oracle, which soared nearly 10% [5]. Group 2: Investor Sentiment and Concerns - Despite the market rebound, fundamental concerns remain regarding whether AI investments will yield the expected profits, with notable declines in stocks like Amazon and Alphabet [3][7]. - Investors are increasingly cautious about the next potential risk point, particularly with upcoming employment reports and inflation data that could influence interest rate policies and market sentiment [3][11]. - There is a notable shift in investment strategies, with funds rotating from technology stocks to defensive sectors like consumer staples, which are perceived as safer during economic slowdowns [11][12]. Group 3: Economic Data and Implications - Recent economic data has not provided much comfort, with the U.S. Labor Department reporting a decrease of nearly 1 million job openings last year and a significant underperformance in private sector job growth for January [10][11]. - The delayed release of the January non-farm payroll report has further muddied investor judgment regarding the economy [11]. - Concerns about the heavy reliance on a few tech giants due to their substantial AI investments may overshadow broader economic weaknesses [8].