Do they know the brand as well as they thought they did? Retailers reject many new products and brands because they don’t have the shelf or display space for them. And the firm itself may become overwhelmed. One more disadvantage is that the firm forgoes the chance to create a new brand with its own unique image and equity.
The worst possible scenario is for an extension not only to fail, but to harm the parent brand in the process. Fortunately, such events are rare. “Marketing failures,” in which too few consumers are attracted to a brand, are typically much less damaging than “product failures,” in which the brand fundamentally fails to live up to its promise.
Product failures dilute brand equity only when the extension is seen as very similar to the parent brand. Even if sales of a brand extension meet high targets, the revenue may be coming from consumers switching from existing parent-brand offerings—in effect cannibalizing the parent brand. Yet intrabrand shifts in sales may not be undesirable if they’re a form of preemptive cannibalization.