Your focus is a scarce asset, which is why marketers spend billions of dollars to attract your attention. Many apps are designed to hook you. Social media companies like YouTube, Facebook, and Instagram know that the more time you spend on their platforms, the more money they make through advertising. Perhaps one of their greatest recent discoveries is the use of notifications. How many times have you opened an app just because a red notification pops up on your screen? And how much time did you waste subsequently? I wouldn’t be surprised if it ran into hundreds of hours each year.

