美联储会议临近，市场情绪谨慎

Group 1: Economic Overview - US consumer confidence has reached its lowest level since May, with a preliminary index of 55.4 for September, down 4.8% from August and down 21% year-on-year [1][4] - The current economic conditions index for September is 61.2, a decrease of 0.8% month-on-month and 3.3% year-on-year, while the consumer expectations index is at 51.8, down 7.3% month-on-month and 30.4% year-on-year [1][4] - Domestic economic conditions in China remain stable, with industrial production growing by 5.2% year-on-year in August [2] Group 2: Copper Market Analysis - There has been a continuous inflow of imported copper, but expectations for domestic copper supply are decreasing, leading to a build-up in electrolytic copper inventories [1][4] - As of September 15, the SMM national mainstream copper inventory increased by 0.99 million tons to 15.42 million tons, with inventory rising in regions outside Shanghai [3] - The average price for SMM 1 electrolytic copper is reported between 80,780 and 81,100 yuan per ton, with a slight decrease in the premium over the previous trading day [3][5] Group 3: Aluminum Market Analysis - The supply of aluminum has seen a slight increase, while terminal consumption is recovering; however, high aluminum prices are suppressing downstream consumption [1][4] - As of September 15, the domestic mainstream consumption area for electrolytic aluminum ingot inventory is 63.7 million tons, an increase of 1.2 million tons from the previous week [3][6] - The price for SMM A00 aluminum is reported at 20,950 yuan per ton, down 70 yuan from the previous trading day [3][6]