A top research analyst cuts his revenue forecasts for Snap, and Blue Apron says it's going to cut 6% of its workforce, just four months after its own IPO. Plus in the latest edition of our Business of Sports show, we look at the just-started NBA season and check out some cool memorabilia ahead of the World Series. And NYSE president Tom Farley joins us on the 30th anniversary of the worst day in stock market history, and Barnes & Noble's digital chief tell us about the company's strategy.