跌超19%，拖累道指！黄金、原油齐涨！

Market Performance - The US stock market showed mixed results, with the S&P 500 and Nasdaq indices rising, while the Dow Jones index fell due to a significant drop in UnitedHealth Group's stock by over 19% [2] - The S&P 500 index increased by 0.41% to 6978.60 points, and the Nasdaq composite rose by 0.91% to 23817.10 points, while the Dow Jones index decreased by 0.83% to 49003.41 points [2] Currency and Trade Policy - The US dollar index has been declining, with President Trump indicating that he is not concerned about the dollar's depreciation [3] - The US continues to adjust its trade policies, maintaining a 50% tariff rate on Indian goods and threatening to raise tariffs on certain South Korean products to 25% [3] Semiconductor Industry - The Philadelphia Semiconductor Index reached a new high, increasing by 2.40% [6] - Micron Technology announced a $24 billion investment plan to build a new memory chip manufacturing facility in Singapore, aimed at increasing production amid a global shortage [6] Technology Sector Developments - Among the "Big Seven" tech companies, only Tesla saw a decline of 0.99%, while Amazon and Microsoft rose over 2% [7] - Google announced a price adjustment for data transmission methods in North America, with some prices doubling, and launched its AI service package in the US at a monthly subscription fee of $7.99 [7] - Microsoft introduced the MAIA 200 chip, an AI inference accelerator based on TSMC's 3nm process, which will support various AI models, including OpenAI's latest GPT-5.2 [7] Commodity Prices - Gold prices continued to rise, reaching $5160 per ounce, driven by geopolitical tensions and central banks accumulating gold as a fundamental currency [9] - International oil prices also increased, with NYMEX WTI crude oil futures closing above $60 per barrel [9]