尾盘，全线跳水了

Group 1 - The core focus of the news is the volatility in precious metals, particularly silver, which experienced significant fluctuations in both domestic and international markets [1][2] - Domestic silver funds showed a slight increase of 0.75% at the close after a dramatic trading session, while New York silver futures initially surged by 7% before experiencing a sharp decline [1] - The trading day saw New York silver futures fluctuate over 10%, with a notable drop of 1.77% after reaching a peak of $82.67 [1] Group 2 - The decline in silver futures led to a broader sell-off in precious and base metals, indicating a market-wide reaction to the volatility [2] - The Chicago Mercantile Exchange announced an increase in margin requirements for various metals, including gold and silver, which is seen as a catalyst for the recent price drops [4] - Historical context is provided, referencing the 1980s incident involving the Hunt brothers, where increased margin requirements led to a significant drop in silver prices, although current market conditions differ due to global inflation [4][5]