SHANGHAI, Sept. 1 (SMM) –Spot copper offers were quoted between discounts of negative RMB 200-100/mt today. Trade prices for standard-quality copper were between RMB 68,330-68,450/mt in the morning business, and RMB 68,400-68,520/mt for high-quality copper. SHFE copper prices continued to rebound, and imported copper increased significantly due to concentrated arrivals. Cargo-holders voluntarily expanded discounts, while traders mainly made purchases due to bullish sentiment in the short term and increased discounts for speculative activity.