Market Snapshot: Dow tumbles more than 600 points on weak Chinese, German economic data, U.S. yield-curve inversion

U.S. stocks fell sharply Wednesday, following a series of worrying data on global economic growth, and after the yield on the 10-year U.S. Treasury note fell below that of the 2-year note, marking an inversion of the main measure of the yield curve, flashing a recession warning signal.