But finding — and holding — a job can also teach teens tons of skills, and help them develop positive work habits early in life. Working teens learn an important financial lesson about how much people really earn per hour, says Nashica McRath, a financial adviser with Edward Jones. \" \" Parents of working teens should insist they save a portion of each paycheck. \"Having too many [work] hours can compromise an adolescent's energy and investment in schoolwork, and that has implications for more than school grades and graduation,\" Glover says. But since then, the number of teens working summer jobs has dropped.