CME Group has increased the collateral requirements for trading in gold, copper and silver futures, The Wall Street Journal reports. Gold margins will be go up 21 percent, silver margins 16 percent and copper margins 18 percent. Speculative investors in the benchmark 100-troy-ounce gold contract will have to put up $11,475 to open a position. For silver, speculative traders will be required to put up $24,875 to trade a 5,000-ounce contract. Copper speculators will need to offer $6,750 to open a contract.
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