Brisk consumer demand keeps Chinese physical copper prices firm; physical traders note high premium over futures prices with consumers taking advantage of lower prices since start of year, says Haihua Shen at Maike Futures. Expects steady trading for metals markets this week though busy week for U.S. economic data including GDP data, Chicago PMI Wednesday, Friday's jobless claims trigger some volatility. LME 3-month copper is at $5,845/ton, up $45 on Friday PM kerb.