The stock market fell nearly 1,200 points yesterday, the Dow’s largest decline in a single day and the biggest drop since 2011, a very volatile year. Monday’s bear market was the equivalent of almost a 4.6 percent loss, which is far from a record in percentage terms. There were 21 days in 2011 with drops of 2 percent or more. The last time the market fell by at least 2 percent was when the U.K. approved the Brexit referendum in 2016. While the market had no drops at that level in 2017, there were 71 daily closing records. On the S&P 500, stocks were down for all of the 505 companies except for two: Church and Dwight, a major consumer goods company, and Trip Advisor. As a sector, financial companies had the worst performance...