RE:RE:RE:Copper Set for Longest Slump in 27 Years on Factory Data I'm more concerned about the supply and demand of copper. According to Goldman Sachs there will be 385,000 tons of surplus copper on the market in 2014 which will contribute to the glut of copper on the market and cause copper prices to "grind lower". There was only a 45,000 ton surplus of copper produced in 2013. "Global supply will exceed demand by 385,000 tons this year, after a 45,000 ton surplus in 2013, and prices will “grind lower,” Goldman Sachs Group Inc. said in a report Jan. 31. "