Money Dow endures worst day since ‘Black Monday’; S&P 500 enters bear market as coronavirus spreads economic gloom March 12, 2020March 12, 2020 Jessica Menton and Nathan Bomey, USA TODAY Comments Off on Dow endures worst day since ‘Black Monday’; S&P 500 enters bear market as coronavirus spreads economic gloom U.S. stocks tumbled into a bear market Thursday after President Trump banned travel from Europe to stem the economic fallout from the coronavirus.