估值担忧持续搅动市场，美股9月如何收官？

Group 1: Market Overview - The U.S. stock market ended a previous streak of weekly gains, with a focus on the Federal Reserve's future policy direction and Chairman Powell's warnings on valuations [1] - The S&P 500 index has risen 2.8% in September, outperforming historical averages, and has a year-to-date increase of 13% [6] - Investor sentiment improved following NVIDIA's announcement of a $100 billion investment in OpenAI, leading to a net inflow of $12.06 billion into U.S. equity funds in the week ending September 24 [7] Group 2: Economic Data - Recent economic data indicates resilience, with initial jobless claims significantly lower than expected, suggesting a stable labor market despite Fed concerns [3] - The Personal Consumption Expenditures (PCE) index showed a slight increase in inflation, with the year-over-year rate rising from 2.6% to 2.7%, marking the highest level since March [3] - The U.S. GDP growth rate for Q2 was reported at 3.8%, the strongest performance since Q3 2023, indicating a significant rebound from a 0.5% contraction in Q1 [3] Group 3: Federal Reserve Insights - Fed officials expressed differing views on inflation and labor market conditions, with Powell indicating a need to balance persistent inflation risks against a cooling job market [4][5] - The upcoming employment report is highly anticipated, with expectations of a net increase of 85,000 jobs, which could influence the Fed's decision to maintain current policies [5] Group 4: Sector Performance - The communication services sector experienced the largest decline, down 2.7%, influenced by significant drops in stocks like Meta Platforms and Alphabet [6] - The energy sector led gains with a 4.7% increase, followed by utilities and real estate sectors, while technology and industrial sectors saw slight increases [6]