期铜上涨，因担忧近期供应紧张【4月29日LME收盘】

Group 1 - London copper prices increased due to concerns over recent supply tightness, with three-month copper rising by $62 to $9,440 per ton [1] - The three-month aluminum price rose by $31.50 to $2,465.50 per ton, while zinc and lead also saw increases of $16 and $10 respectively [2] - Nickel and tin prices, however, decreased, with nickel falling by $65 to $15,550 per ton and tin down by $102 to $31,919 per ton [2] Group 2 - COMEX copper inventories increased by 40% this month amid investigations into potential new copper import tariffs by Washington, with a significant premium of $1,443 per ton over LME copper [3] - The global copper market is expected to see a surplus increase from 138,000 tons last year to 289,000 tons this year, with continued oversupply projected for next year [3] - The U.S. trade deficit reached a record high of $162 billion in March, indicating a significant drag on first-quarter GDP growth, estimated to be as much as 1.9 percentage points [3]