The issue of when and if consumers will notice a difference between two stimuli is relevant to many marketing situations. Sometimes a marketer may want to ensure that consumers notice a change, as when a retailer offers merchandise at a discount. In other situations, the marketer may want to downplay the fact that it has made a change, such as when a store raises a price or a manufacturer reduces the size of a package (see the “CB as I See It" box on reference prices)