WASHINGTON, United States (AFP) – Outgoing Federal Reserve chief Janet Yellen said Friday she did not believe the major gains on Wall Street in recent months qualified as a “bubble,” but nevertheless warned investors to remain cautious. Yellen, who leaves her post on Saturday and will be replaced on Monday by Jerome Powell, made the comments in an interview with PBS television before the Dow closed down more than 650 points, its biggest drop since June 2016. […]