现货黄金向上突破3300美元/盎司，上海金（159830）开盘涨超2%，机构：黄金在短期调整后有望维持长期上行趋势

Group 1 - Spot gold prices broke the $3,300 mark for the first time since May 9, reaching $3,290.40 per ounce as of 9:37 AM on May 21 [1] - The Shanghai Gold ETF (159830) opened with a surge of over 2%, with a current increase of 2.49% [2] - Moody's downgraded the U.S. sovereign credit rating from Aaa to Aa1 due to rising government debt and interest payments, impacting U.S. Treasury securities [2] Group 2 - Short-term factors such as tariff negotiations may suppress gold prices, but medium to long-term outlook remains positive due to high real yields on 10-year U.S. Treasuries and a trend towards stagflation in the U.S. economy [3] - Long-term forecasts suggest that after a phase of price correction, gold prices are expected to maintain an upward trend due to declining dollar credit and ongoing purchases by global central banks [3]