Has the stock market had a more brutal week? Sure, but not many. Stocks on Thursday were in a nearly unmitigated selloff prompted by coronavirus fears that could amount to the worst week for the major equity indexes since the 2008 financial crisis. The Dow Jones Industrial Average DJIA, -0.87% was pace for its steepest weekly slide, down 9.4%, since Oct. 10, 2008, when it skidded 15.3%. The S&P 500 index SPX, -1.11% was most recently off 9.3%, which would also represent its sharpest weekly slump since a 18.2% decline in October of 2008. The Nasdaq Composite Index COMP, -1.07% Nasdaq was off 9.4% for the week and set for its sharpest weekly skid since 2008. All three benchmarks fell into correction territory early Thursday, defined as a drop from a recent peak of at least 10%, but not greater than 20%.