Here's another reason to get your teen to stop acting so mopey. They'll likely earn more money when they get older.
Researchers tracked thousands of adolescents for more than a decade. What they found is the teens who were down and out earned 30% less than the average salary of a 29-year-old.
Happier teens earned 10 percent above the average. It's not clear why high spirits mean a bigger paycheck.
But it does suggest to parents that they should focus on their teen's feelings and help them work through tough times.