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In recent years, companies have been confronted with a new type of negative consumer behavior: consumers who have turned hostile and who are strongly determined to cause damage to the brand. Empowered by new technological possibilities, an individual consumer can now wreak havoc on a brand with relatively little effort. In reflection of this new phenomenon, the authors introduce the concept of consumer brand sabotage (CBS). On the basis of different underlying motives, a conceptual framework distinguishes CBS (a form of hostile aggression: harming the brand as dominant motive) from other forms of negative consumer behavior, such as customer retaliation and negative word of mouth (instrumental aggression: harming a brand is only a means to achieve other objectives, e.g., restoring equity). This framework adapts insights from aggression and appraisal theories as well as qualitative interviews with …