Market Overview - On October 17, global markets experienced a significant downturn, referred to as "Black Friday" [2][4] - Major U.S. stock index futures continued to decline, with Nasdaq 100 futures down 1.5%, S&P 500 futures down 1.4%, and Dow futures down 1% [5] - Japanese stock futures fell approximately 2% after market close, and European markets opened with collective declines [6] A-Share Market Performance - The A-share market opened lower and continued to decline throughout the day, with the Shanghai Composite Index down 1.95%, Shenzhen Component Index down 3.04%, and ChiNext Index down 3.36% [8] - Only 602 stocks rose, while 4,783 stocks fell, indicating a broad market sell-off [10] Key Factors Behind the Market Decline - Concerns over a potential credit crisis were triggered by the significant drop in shares of two U.S. regional banks, Zions Bancorp and Western Alliance Bancorp, due to fraud allegations related to commercial mortgage loans [12] - The KBW Bank Index recorded its largest drop in six months, with a total market value loss exceeding $100 billion across 74 large U.S. banks [13] - Additional worries arose from the potential escalation of U.S.-China trade tensions, highlighted by Micron's decision to halt the supply of server chips to data centers in China [11]