Last December, Australia banned social media for anyone under 16. Four months later, only one in four 14- and 15-year-olds were complying, a share that has since fallen further. In this episode of The Pie, Leonardo Bursztyn, the Saieh Family Professor of Economics at the University of Chicago and co-director of BFI's Political Economics Initiative, discusses why the ban hasn't worked, and what a successful one might entail.