Copper prices have slumped to their lowest in six years as the world has revised down its estimates of future growth in China.

铜价已跌至六年来的最低点，原因是外界下调了今后中国的经济增长预期。

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Macquarie Research says current copper supply shortages are a main reason we could see higher copper prices in the near future.

FORBES: Supply Pinch Could Prop Up Price Of Copper

The answer hinges on the future prices of copper, gold and molybdenum.

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