现货白银再次大跌，芝商所在一周内第二次提高贵金属期货的保证金

Group 1 - The core point of the article is that spot silver has fallen below $73, experiencing a decline of over 4% in a single day [1] - CME Group announced an increase in margin requirements for gold, silver, platinum, and palladium contracts effective after the market close on December 30, citing the need to assess "market volatility to ensure adequate collateral coverage" [1]