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“Ingroup Bias” books explore the human tendency to favor those we see as part of “our” group—whether defined by nation, race, religion, ideology, workplace, team, or online tribe—and to judge outsiders more harshly. This category spans psychology, sociology, political science, history, and behavioral economics, unpacking how group identity shapes perception, memory, morality, and decision-making, and how it fuels polarization, discrimination, and conflict as well as cohesion and cooperation. Titles often blend classic experiments and theory (e.g., social identity and minimal group findings) with case studies from classrooms, companies, fandoms, elections, and wars, showing how leaders, institutions, and algorithms can activate or exploit tribal loyalties. Many works also examine remedies—intergroup contact, shared goals, inclusive norms, institutional design, and narrative empathy—that reduce bias and bridge divides. The shelf includes academic syntheses, popular science, investigative journalism, memoirs from divided communities, and fiction that dramatizes tribal dynamics.

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