刚刚！美股大牛市，突遭警告！

Core Viewpoint - The article highlights a warning from Ed Yardeni, a prominent Wall Street analyst, indicating that the extreme bullish sentiment in the U.S. stock market may signal a potential downturn, with the S&P 500 index expected to decline by 5% by the end of December [2][4]. Market Sentiment and Indicators - Ed Yardeni's warning comes as the S&P 500 index has risen 37% since early April, marking one of the longest bullish runs since 1950, with the current bullish-to-bearish ratio reaching 4.27, indicating excessive optimism [4][5]. - The Nasdaq 100 index is also trading 17% above its 200-day moving average, suggesting a potential overextension in the market [5]. - A significant number of stocks are declining even as the S&P 500 rises, indicating a weakening market breadth [6]. Liquidity Concerns - The U.S. financial system is showing signs of liquidity stress, with the secured overnight financing rate (SOFR) rising 18 basis points to 4.22%, the largest increase in a year [2][7]. - The usage of the Federal Reserve's standing repo facility (SRF) reached a historical high, indicating increasing liquidity pressures [7][8]. - The liquidity crisis is exacerbated by the U.S. government shutdown, which has drained approximately $700 billion from the market, creating a tightening effect similar to multiple rate hikes [8]. Potential Market Reactions - Analysts suggest that if the government reopens, it could lead to a significant influx of cash into the market, potentially resulting in a rebound for risk assets [8]. - The article notes that the fate of capital markets may hinge on political decisions regarding the government shutdown, with expectations that a resolution could lead to a rapid normalization of the repo market [8].