AI估值泡沫担忧致美股全线收跌，投资机构表态“审慎乐观”

Group 1 - The U.S. stock market experienced a decline, with the Dow Jones falling by 1.18% to 46,590.24 points, the S&P 500 down by 0.92% to 6,672.41 points, and the Nasdaq decreasing by 0.84% to 22,708.07 points, indicating market volatility and investor concerns [1] - Concerns regarding an AI valuation bubble, sector rotation, and changes in Federal Reserve interest rate expectations are influencing market sentiment [1] - Despite recent market declines, many U.S. companies reported third-quarter earnings that exceeded expectations, suggesting economic resilience and a cautious optimistic outlook for the stock market [3] Group 2 - The AI sector remains a focal point for investment, with a significant portion of funds allocated to AI and technology stocks, reflecting ongoing confidence in the industry [3] - Morgan Stanley's 2026 global strategy outlook anticipates a "risk restart year," predicting a shift in market focus from macroeconomic factors to microeconomic ones, driven by a unique combination of fiscal, monetary, and regulatory policies alongside the AI investment cycle [3] - The S&P 500 index is projected to rise to 7,800 points, representing an approximate 15% increase from current levels, driven by strong corporate earnings growth [3]