American teenagers spend an astounding nine hours a day with digital technology, watching videos, listening to music and playing games. And if you think this is just a US phenomenon, consider that 90% of children under the age of 18 in China have access to a mobile phone, comparative to the US's staggering 88%. Specifically in the teen years, aged 13-17, a survey by the nonprofit Common Sense Media found that 95 percent of U.S. teens have their own mobile device, spending an average of 7 hours a day on screentime. The impact on social norms has been immense: Teens are spending more hours with media and technology than they do with their parents, time in school, or doing any other thing. This complicates the task of educating teens on financial responsibility, an historically parental duty.