今天，A股有一个微妙变化，和两个“不变”

Market Overview - On December 18, the three major indices showed mixed results, with the Shanghai Composite Index rising by 0.16%, while the Shenzhen Component Index fell by 1.29% and the ChiNext Index dropped by 2.17% [13][14] - The market saw nearly 2,900 stocks rise, with a total trading volume of 1.66 trillion yuan, a decrease of 155.7 billion yuan from the previous trading day [14][15] Sector Performance - The pharmaceutical commercial, banking, and retail sectors led the gains, while battery and power grid equipment sectors experienced declines [14][25] - The micro-cap stock index rose by 1.79%, marking its largest single-day gain this month, and has increased by 75.94% year-to-date [18][27] Investment Trends - The concept of "reward economy" emerged, where consumers purchase non-essential goods or services to alleviate stress, indicating a shift in consumer behavior [25][26] - The new consumption sector is expected to evolve towards sustainable business models and profitability, with a focus on health, practicality, and emotional consumption [26][27] Regulatory Changes - The National Healthcare Security Administration and the Ministry of Human Resources and Social Security announced an adjustment to the national medical insurance drug list, adding 114 new drugs, including 50 innovative drugs, effective January 1, 2026 [27][28] Commercial Aerospace Activity - The commercial aerospace sector remains active, with the Long March 12A reusable rocket scheduled for its first launch in December 2025, reflecting a shift towards cost-effective manufacturing and increased launch frequency [28]