A letter arrives in the mailbox with the logo of your energy company on the front. Tired of paying an endless stream of bills, you leave it sitting on the bench for several days before opening. You’re sure that it is another bill inside. When pragmatism beats procrastination you open the letter to find a delightful surprise: it is not a bill at all! Just a little letter to say that you are on the best plan for the amount of electricity you use. Aaah, happy days!