Why Snap's Stock Fell 43% in a Day

Things were already tough for Snap, Snapchat's parent company, thanks to big changes in the ad market. Then last week the company made a surprise announcement: It's worse than we thought. WSJ’s Meghan Bobrowsky explains the reasons behind Snap’s stock tumble, and why it’s raising concerns about other tech companies too. Further Reading: - Tech Stocks Continue to Fall After Snap’s Profit Warning  - Snap Plunges, And There Goes Social Media’s Online Ad Biz  Learn more about your ad choices. Visit megaphone.fm/adchoices