20年来首现“过度投资”！美银基金经理调查：AI泡沫已成市场上最大“尾部投资”

Core Viewpoint - Market sentiment is oscillating between optimism and caution, with fund managers showing increased stock allocations while cash levels have dropped to 3.7%, triggering a "sell signal" [1][2][13] Group 1: Market Sentiment and Risks - Fund managers' stock allocation has reached its highest level since February 2025, but cash holdings have decreased, raising concerns about overly bullish positions potentially hindering risk assets [2][13] - 45% of respondents view the "AI bubble" as the biggest tail risk, a significant increase from the previous month, while 54% consider "longing the seven giants" as the most crowded trade [2][8] - 63% of respondents believe current stock market valuations are too high, indicating a growing concern about the sustainability of the market rally [4][10] Group 2: Economic Outlook - Despite improved macro sentiment, with 53% of investors predicting a soft landing for the economy, there are warnings about excessive corporate investment, a phenomenon not seen in 20 years [5][10] - 43% of investors see broad AI productivity improvements as the most bullish catalyst for 2026, while 26% view a slowdown in AI capital expenditure as a significant bearish factor [10][20] Group 3: Asset Allocation Trends - In November, investors significantly increased allocations to healthcare (net 40% increase), emerging market stocks (net 36% increase), and bank stocks (net 36% increase) [17] - Conversely, UK stocks saw the fastest decline in allocation since October 2022, and consumer discretionary stocks experienced the largest monthly reduction since 2005 [17] Group 4: Future Expectations - Looking ahead to 2026, 42% of investors expect international stocks to be the best-performing asset class, with 30% anticipating the Japanese yen to perform best among currencies [19][20] - 45% of investors expect the 10-year U.S. Treasury yield to be in the 4.0%-4.5% range by the end of 2026, while 34% predict gold will trade between $4000 and $4500 per ounce [20]