最新报道:Market cycles are narrowing as AI and tech giants dominate equity performance, with the S&P 500’s cap-weighted version returning 70.9% vs. 49.4% for the equal-weight version from mid-2022 to mid-2025. This concentration, reminiscent of past bubbles, heightens systemic risk, as seen in sharper corrections for cap-weighted indices. Analysts warn of an AI-driven bubble amid high valuations and weak semiconductor sector signals. Investors are shifting toward equal-weight and trend-following strategies to mitigate volatility and reduce overexposure to tech leaders.