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总结
在黄金、白银等贵金属因获利了结与仓位调整出现罕见剧烈震荡、银价一度录得四年来最差单日表现后，芝加哥商品交易所CME宣布再次上调黄金、白银等期货及期权合约保证金，要求会员和交易者投入更多抵押品以控制清算风险。此举可能迫使杠杆多空补缴资金或减仓，放大短期波动并降低流动性，也显示交易所对年末“过山车”行情和潜在违约风险的警惕，铂金等品种亦从高位回落。保证金提高将抬升套保与投机交易成本，影响企业风险对冲与价格发现，并为后续宏观数据和利率预期变化下的贵金属走势增添不确定性。
正文
CME Hikes Precious-Metal Margins Again After Wild Price Swings Bloomberg.com 'We're in a metals war': Gold, silver rebound after sharp sell-off Yahoo Finance Gold and silver see rollercoaster end to blockbuster year BBC Silver is rebounding after its worst trading day in four years. Here's what is behind the move. CBS News Precious metals drop amid profit taking; silver, platinum retreat from record highs Reuters
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