In recent years, a so-called ‘three-year rule’ has circulated widely in financial markets—the idea that since the 2009 financial crisis, the S&P 500 has experienced a significant correction or bear market roughly every three years. Examples include the 2011 European debt crisis, the 2015 Fed rate hike expectations, the 2018 interest rate hikes and trade war, and the aggressive monetary tightening in 2022 triggered by high inflation—all loosely aligning with this pattern. As we enter 2024, however, many question whether this ‘rule’ still holds predictive power.Proponents argue that economic cycles, policy shifts, and investor sentiment naturally create a risk accumulation-and-release window every three years or so. Critics counter that the pattern lacks rigorous statistical backing and is largely a retrospective coincidence. Today’s environment further challenges the rule: the U.S. economy shows notable resilience, corporate earnings remain solid, structural growth is driven by innovations like AI, and expectations of a dovish pivot from the Federal Reserve are strengthening—potentially boosting market resilience.Moreover, sustained global demand for U.S. equities as long-term assets, the safe-haven appeal of dollar-denominated investments, and continuous innovation from leading tech firms may all help break the historical reliance on this three-year cycle. Rather than adhering to cyclical myths, investors should focus on fundamentals, monetary policy trajectories, and geopolitical risks. If a soft economic landing materializes, the U.S. stock market could extend its bull run—and truly defy the ‘three-year rule.’
近年来，市场广泛流传着‘美股三年定律’的说法——即自2009年金融危机后，标普500指数几乎每隔三年就会经历一次显著回调或熊市。例如，2011年欧债危机、2015年美联储加息预期、2018年利率上升与贸易战、以及2022年高通胀引发的激进加息周期，都大致符合这一节奏。然而，进入2024年，这一‘定律’是否仍具参考价值引发热议。支持者认为，经济周期、政策调整与市场情绪共同作用，使得三年左右成为风险累积与释放的自然窗口。但反对者指出，该规律缺乏严谨统计依据，更多是后视镜下的巧合。尤其在当前环境下，美国经济展现出较强韧性，企业盈利稳健，AI等新技术推动结构性增长，加之美联储转向鸽派预期增强，市场抗压能力可能已提升。此外，全球资本对美股的长期配置需求、美元资产的避险属性，以及美股头部科技股的持续创新力，都可能打破过去‘三年一调’的路径依赖。因此，与其迷信周期规律，不如关注基本面变化、货币政策走向及地缘政治风险。若经济软着陆实现，美股或有望延续牛市，真正打破‘三年定律’。
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