AI行情再审视：2020年以来A股结构性行情深度镜鉴

Group 1: Macro Narrative and Market Ecology - Since 2020, the A-share market has transitioned from a total-driven model to a structural market characterized by macro momentum shifts, changes in funding behavior, and iterative industrial logic [8][9] - The macro background indicates a fundamental shift from a traditional growth model driven by real estate and infrastructure to a new paradigm centered on technology and manufacturing [8][9] - The structural opportunities for excess returns are concentrated in sectors aligned with industrial upgrades and national strategic directions [8][9] Group 2: Changes in Funding Behavior - The public fund industry experienced significant expansion from 2020 to mid-2021, with a notable influx of retail savings into the capital market through actively managed equity funds [10][13] - From 2022 to 2024, the trend shifted towards passive investment, with ETF inflows significantly outpacing actively managed funds, indicating a move from individual stock alpha to industry or style beta opportunities [13][16] - By 2023, institutional funding behavior underwent a strategic transformation, reducing reliance on retail trading sentiment and emphasizing long-term performance based on fundamental trends [16][17] Group 3: Deep Review of Structural Markets Post-2020 Consumer and Pharmaceutical Sector - The consumer and pharmaceutical sectors gained significant valuation premiums during the pandemic due to their demand rigidity and stable cash flows, becoming ideal defensive assets [20][21] - The market's focus on these sectors was driven by high visibility of earnings and a favorable macro environment, leading to a systematic concentration of funds [20][21] New Energy Sector - The new energy sector emerged as a dominant theme from mid-2021 to 2022, driven by the "dual carbon" goals and rapid performance growth across the industry [43][46] - The sector's growth was characterized by a "Davis double play," where strong earnings growth supported stock price increases without excessive valuation expansion [46][49] - By late 2021, the new energy market experienced a supply-demand gap, with significant price increases in upstream resources indicating robust downstream demand [53][54] General AI Sector - The current AI market is driven by a narrative of technological revolution and productivity enhancement, contrasting with historical tech bubbles due to more rational funding choices and unique geopolitical dynamics [8][9] - The AI sector's long-term potential is supported by solid earnings from tech giants and a strategic focus on capital expenditures that align with defensive growth strategies [8][9]