美股三大指数齐跌 技术指标现“过热”警告

Market Overview - The U.S. stock market indices closed lower on Monday, with the Dow Jones Industrial Average down 0.94%, the S&P 500 down 0.79%, and the Nasdaq Composite down 0.92% due to market sentiment affected by Trump's renewed tariff plans [1] - Investors opted for profit-taking ahead of the holiday, contributing to the decline in market indices [1] Technical Indicators - A widely watched market technical indicator has signaled a potential market "overheating," as the S&P 500 index has broken its upper Bollinger Band seven times in the past eight trading days [1] - Jason Goepfert from SentimenTrader noted that this phenomenon is particularly notable given the current historical high levels of the S&P 500, raising questions about whether it indicates extraordinary momentum or a typical "too fast" signal [1] - The Bollinger Bands, created by financial analyst John Bollinger in the 1980s, assess whether stock prices are in an "overbought" or "oversold" state by calculating the moving average and adding/subtracting two standard deviations [1] Historical Context - Historical data shows that whenever the S&P 500 triggers this signal at multi-year highs, the index tends to decline in the following week [2] - However, the medium to long-term outlook is mixed, with the S&P 500 having ten instances of rising over 5% and ten instances of falling over 5% within six months after triggering the signal [2] - Notably, only in 1966 and 2000 did such instances lead to bear markets [2] Impact of Tariff Plans - The market turmoil is also influenced by Trump's announcement of a 25% tariff on exports from Japan and South Korea starting August 1, which has overshadowed hopes for an agreement to avoid such tariffs [2] - The initial proposal of "reciprocal tariffs" by Trump in April raised concerns on Wall Street about the potential negative impact on global trade and the U.S. economic recovery [2] - The Russell 2000 small-cap index experienced the largest decline, dropping 1.55% on Monday [2] Future Performance Expectations - Historical performance data indicates that after similar market conditions, the median return for the Russell 2000 over two months is +4.8%, while the S&P 500 shows a return of -0.7% [3] - Additionally, the Nasdaq has an 80% probability of positive returns after five months, compared to 68% for the S&P 500 [3]