There's an entire sector of the economy run by people who are working diligently to get inside your head and harvest your attention? Does that creep you out? They're called the Attention Merchants. And their business model consists of attracting your attention and then reselling it for profit. They're ad-based TV channels, clickbait producers and the big social media producers. Law professor Tim Wu is the author of "The Attention Merchants: The Epic Scramble to Get Inside Our Heads."