In Brief A rough week for tech stocks might signal a loss of investor confidence in artificial intelligence.The Wall Street Journal reports that the Nasdaq Composite Index was down 3% — making this its worst week since President Donald Trump announced his sweeping tariff plan in April. Tech companies that have otherwise performed well this year were among those hardest hit, with Palantir’s stock price falling 11% this week, Oracle declining by 9%, and Nvidia losing 7%. These drops also come after earnings ...