Shanghai Futures Exchange copper stocks jump by 17,449 tons vs 2 weeks ago, to 85,269 tons, in line with market speculation earlier in the day; analysts attribute rise to approaching delivery date, less buying on spot market during week-long holiday. "Given strong macro economy, there's no problem at the demand side; the large supply will likely to be gradually absorbed in the second quarter, along with less imports during the time," says trader in Shanghai.