Social identity theory posits that individuals do not possess a single fixed identity but rather hold multiple social identities tied to different groups. These identities are defined by shared values, norms, and beliefs, allowing people to shift allegiances—such as moving from rival football club supporters to unified national team fans—provided there is no inherent conflict between the groups. For brands, this means that attempting to capture disparate customer sets requires a unifying shared value. If a brand tries to form groups around conflicting identities without a common anchor, the strategy will fail because the individual cannot reconcile those competing social identities.