Children and preteens wield $1.2 trillion in purchasing power every year. This is through items they buy directly, or that they convince their parents to buy for them, according to a 2018 Viacom report. And tech companies know it. Reset learns more about the effects tech and advertising can have on children’s learning and values with Susan Linn, psychologist, child play expert and author of Who’s Raising the Kids?: Big Tech, Big Business, and the Lives of Children.