The trouble with too many fast-food restaurants is that they're often so close together. It's like car dealers who line up in auto malls, waiting for customers to greet each brand in turn, as if it's a wedding line. With the fast-food joints, rivals can see what the competition is doing by just looking out of the window. Which makes me wonder what the staff at McDonald's are going to be thinking next year. You see, one of McDonald's peskier rivals -- Wendy's -- just announced that it's going to start doing something that may seem a touch obvious. It's...