Copper ends down amid extended Chinese demand lull

Copper ended lower on Friday, building upon the 2.4-percent loss recorded in the first� quarter, as a lull in Chinese buying and a rising trend in inventories continued to reflect near-term demand weakness. Copper's losses at the start of the new quarter bucked the firmer tone in U.S. equities, which raced to their highest level since June 2008 after data showed a second straight month of

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