On October 9, an analysis by foreign media highlighted that U.S. President Trump has consistently viewed stock market performance as a key indicator of his administration's success. Despite the S&P 500 index reaching an all-time high this week, this surge has been largely propelled by a select group of companies capitalizing on the artificial intelligence boom. This trend, in turn, has obscured the fundamental fragility within the U.S. economy and financial markets. As the midterm elections draw near, the stock market gains that Trump had anticipated would bolster the Republican Party could instead turn into a political liability. Notably, sectors such as consumer goods, tourism, transportation, real estate, and finance have generally witnessed a decline in their stock prices. Over the past month, the median stock price of S&P 500 constituents has dropped by approximately 4.3%. However, the robust performance of companies like Meta, Microsoft, Nvidia, and the semiconductor industry has masked the weaknesses prevalent in most sectors of the U.S. stock market. On Tuesday, while the S&P 500 index hit a record peak, only 30% of its constituents were trading above their 50-day moving average. This figure falls significantly short of the 41% observed during the period of the narrowest market breadth in the 1998-2000 dot-com bubble.