Copper Gains for Third Day as Rio Fuels China Demand Speculation

Copper rose for a third day in New York as Rio Tinto Group became the latest producer to stoke speculation that demand will maintain its pace in China, the world's largest consumer of the metal. Copper usage in China and other emerging markets will gain more quickly than output, prompting a global deficit, according to Rio, which mines for the metal in places from the U.S. to South Africa.

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