Apprenticeships can provide a ticket to the middle class for people who’ve been left behind by “college for all.” Supporters on both the right and the left say the “earn while you learn” approach can help create a more skilled workforce, provide a path to solid, middle-class careers, and serve as a needed corrective to the “college for all” push that has left some students with piles of debt and no obvious career. Tune to Old Idea, New Economy: Rediscovering Apprenticeships for an examination of apprenticeships.