No matter what you design, its ultimate destination is the human mind. And, just like any other medium, there are limitations to consider when you design for it. Knowing that, how can you apply a basic understanding of cognitive psychology and behavioral economics to your design work? Can you make cognitive bias work for you instead of against you? By thinking about your user’s attention in an economic model, you can design to create value, as well as preserve it. You can help your users spend their attention wisely, and invest it well.