The U.S. stock market is encountering resistance at high levels, with concerns arising over the substantial investments made by major tech companies in artificial intelligence (AI). According to Ming Pao, there is uncertainty about whether future returns will meet expectations, leading to pressure on U.S. stocks. This pressure has also impacted the Hong Kong stock market, causing the Hang Seng Index to open and close lower. Fortunately, this appears to be an isolated development, primarily due to the pressure on the stock prices of certain weighted stocks within the Hang Seng Index.