Sept. 14 (MF Global) -- This market comment was written at 8:40 a.m. on September 13th, US east coast time...

Metals have been quite weak over the last few days, with the selling particularly concentrated in copper and zinc as opposed to some of the others. In fact, copper hit a one-month low yesterday, shrugging off an impressive trade number from China that showed copper imports rising 11% from a month earlier.