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The rise of the US S&P 500 index primarily reflects strong leadership by a limited number of major companies related to artificial intelligence, with seven giant firms such as Nvidia, Microsoft, and Apple controlling about 34% of the index's market value. Companies connected to AI account for more than half of the entire market capitalization of the index. This concentration mirrors the intertwined performance of the technology sector and AI-related infrastructure with the overall market trend. Although weaker performance among other components has little impact on the index due to the large market weights of the leading companies, analysis shows that the growth in earnings and massive investments by these firms in data centers and chips boost the market's rise. However, there are risks of profit declines or falling stock valuations, especially amid rising interest rates, which could threaten the sustainability of this upward trend.
Notice: This Is an AI-Generated Summary
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