Within minutes of the U.S. stock market opening on Monday, the S&P 500 sunk so swiftly that it triggered a 15-minute pause in trading, a rare event meant to prevent stocks from crashing. We look at why this happened and what it means for the U.S. economy.“The Latest,” from the team behind “The Daily,” brings you the most important developments on today’s biggest news stories. You can find more information about it here.