A bruising stock selloff continued, erasing more than 650 points from the Dow Jones Industrial Average as Treasury Secretary Steven Mnuchin tried to instill calm into a jittery market. Coming off the stock market’s worst week since the 2008 financial crisis, the Dow Jones Industrial Average, S&P 500 and Nasdaq Composite fell for a fourth straight session Monday as investors continued to weigh the impact of rising interest rates, slowing U.S. growth, and the ramifications of a government shutdown extending into January. With the selloff showing little signs of slowing, Mr. Mnuchin attempted to reassure investors, saying he had spoken...
