Mere group membership suffices to trigger self-esteem-linked favoritism.

Evidence

In this form, in-group bias is identified as the minimal group effect. … The minimal group effect indicates that shared group membership provides a sufficient link to self to permit implicit operation of self-esteem. — Anthony G. Greenwald and Mahzarin R. Banaji, Implicit Social Cognition, 126

Categorization

• XREF: Minimal group effect + Tajfel links straight to the intergroup-defense material of the MOC the reader is testing implicit measures against. — connects to: Self-esteem threat spurs ingroup favoritism, but chronic low self-esteem does not — , Rudman, Laurie A - On the Nature of…, 343; Ingroup favoritism stems from projecting self onto ingroup, not from self-enhancement striving — , Rudman, Laurie A - On the Nature of…, 340; Mere arbitrary group membership, with no interaction, triggers in-group favoritism — John T. Jost and Jim Sidanius, Political Psychology, 2704 (+9 more)

Broader Connections

• Only emotional attachment to one’s group, not categorization or self-esteem, drives in-group favoritism #contradicts (0.90) — Roderick M. Kramer, Geoffrey J. Leonardelli, Robert W. Livingston, Social Cognition, Social Identity, and…, 1748
• Ingroup favoritism stems from projecting self onto ingroup, not from self-enhancement striving #contradicts (0.85) — , Rudman, Laurie A - On the Nature of…, 340
• People derive self-worth from group membership and denigrate outsiders to protect it #expands (0.82) — , Rudman, Laurie A - On the Nature of…, 1495
• Self-esteem threat spurs ingroup favoritism, but chronic low self-esteem does not #qualifies (0.78) — , Rudman, Laurie A - On the Nature of…, 343
• Mere arbitrary group membership, with no interaction, triggers in-group favoritism #qualifies (0.78) — John T. Jost and Jim Sidanius, Political Psychology, 2704
• Discriminating against out-groups directly raises self-esteem #contradicts (0.78) — John T. Jost and Jim Sidanius, Political Psychology, 2734
• Merely categorizing people into us and them generates in-group favoritism and out-group devaluation #qualifies (0.78)
• People pursue self-worth through favorable evaluations of their groups #expands (0.74) — John F. Dovidio, Peter Glick, Laurie A. Rudman, On the Nature of Prejudice, 1495
• Salient group membership extends the psychological self to the ingroup #expands (0.72)