In episode 10 of the Big Green Economics Podcast, Dartmouth economist David Blanchflower shares his research on the dramatic decline in youth well-being, which began in 2011 and may be closely tied to the rise of social media. In this episode, Blanchflower explains how his research, once defined by the U-shaped happiness curve, now reveals a collapse in well-being among 18-to-25-year-olds. He explores how happiness is measured, what the data reveals, and what can be done to address this mental health crisis.