Take one example from the hotel business. Many hotel rooms, especially in Europe, require that the plastic room key used to enter the room be inserted in a slot by the door in order to turn on the lights. When the key is removed, the lights and air conditioning go off, but the power to the clock radio does not. Why are rooms designed this way? Because the hotel company has to pay the utility bills, and management knows that customers have no incentive to turn out the lights. Hotel companies are willing to pay the extra cost up front to include this feature.
