Why young women are showing off their shopping sprees in online videos called “hauls.”

Marisa Meltzer:

Somewhere in America’s suburbs, 16-year-old Blair sits in her pink-walled bedroom and shows off a slew of recent purchases from the fast-fashion chain Forever 21. She bought a black blouse, a slouchy cardigan, and $6.99 jeans. “OK, so normally it would bother me if my jeans didn’t have any detail on the rear end,” Blair says.