午后，股市突发！发生了什么？

Core Viewpoint - The market experienced a significant downturn in the afternoon, particularly in the Hong Kong stock market, with brokerage stocks and innovative pharmaceuticals facing substantial declines, while bank and oil & gas stocks saw a rebound. This shift is attributed to geopolitical uncertainties and the triggering of the "weak side convertibility guarantee" for the Hong Kong dollar [1][4]. Market Reaction - The afternoon market structure showed a clear divergence, with risk-sensitive stocks like innovative pharmaceuticals and brokerages plummeting, while bank stocks surged to new highs. For instance, Hong Kong's brokerage stocks such as 弘业期货 and 国泰君安国际 dropped over 9% and 7% respectively, while major banks like 工商银行 and 农业银行 reached historical highs [2][3]. Geopolitical Factors - Analysts suggest that rumors regarding the unfavorable situation of Iran's Supreme Leader's son,穆杰塔巴·哈梅内伊, are influencing market sentiment, leading to a decline in risk appetite and a rise in oil and gas stocks [4][6]. Currency Mechanism Impact - The Hong Kong Monetary Authority (HKMA) triggered the "weak side convertibility guarantee" for the Hong Kong dollar, selling USD and buying HKD worth 94.2 billion. This is the first occurrence since May 2023, indicating a cautious market sentiment following the event [4][6]. Liquidity and Interest Rate Projections - According to Citigroup's estimates, the HKMA's actions could withdraw approximately 70 to 100 billion HKD in liquidity, potentially raising short-term HKD interest rates to between 2% and 3%. However, this fluctuation is occurring during a period of a weakening USD index, not due to a strengthening USD [6][7]. Market Outlook - Some mainland brokerages believe the impact of the HKD's weak side guarantee is limited, citing the resilience of the Hong Kong stock market and the strong fundamentals of the Chinese economy. They anticipate that any liquidity tightening will be manageable and may even present investment opportunities [7][8].