Which psychologist theorized that group membership fills needs for social comparison?

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Leon Festinger is known for his social comparison theory, which suggests that individuals determine their own social and personal worth based on how they stack up against others. This theory also posits that people have an innate drive to evaluate themselves, often in comparison to others, which can lead to efforts to improve their own status or abilities within a group.

Which Psychologist Theorized That Group Membership Fills Needs for Social