SHANGHAI, Apr. 24 (SMM) –Discounts on spot copper were quoted between negative RMB 70-20/mt in Shanghai in the morning business. Traded prices for standard-quality copper were between RMB 57,380-57,560/mt, and RMB 57,420-57,680/mt for high-quality copper. As SHFE copper prices experienced volatilities, the price gap among all SHFE copper contracts was reverted, leaving little speculative room. The SHFE/LME copper price ratio remained unfavorable, causing cargo-holders to reduce sale volumes. Spot copper supply thus decreased. Owing to cash flow problems at the month’s end, both traders and downstream producers stuck to the sidelines.