The average Stash user earns $45,000 a year. Common employers include Wal-Mart, Uber, the U.S. Postal Service, and, especially the U.S. military, with service members making up one in eight users. The app seems to spread by word of mouth on bases, ships, and even submarines, Robinson said. Darrin Graham, a 25-year-old soldier, puts about $25 a week in his Stash account and has two Army buddies who use the app. Like Peng, Graham has a separate retirement account, through the military. He thinks of his Stash account, now with $620, as “play money,” an affordable way to learn about investing.

http://www.bloomberg.com/news/articles/2016-10-14/is-it-safe-to-get-excited-about-investing-again