Shared social identity both causes group behaviour and is caused by it.

Evidence

It is important to reiterate that, for collective identity to politicize, these grievances must be experienced as widely shared among in-group members. Collective identity itself should be a facilitating factor here because it fosters homogenization and (self- )stereotyping processes that in turn transform “your” and “my” experiences into “our” experiences (Simon & Hamilton, 1994; Turner et al, 1987). Collective identity thus heightens the awareness of shared grievances. Conversely, shared grievances also reinforce collective identity in that special treatment or events affecting primarily the ingroup (e.g., its material living conditions, values, principles, or privileges), but not other groups, enhance the social-contextual fit or salience of “us-them” distinctions (Simon, Pantaleo, & Mummendey, 1995; Turner et al., 1987). The causal relationship between collective identity and awareness of shared grievances is therefore bidirectional. — John T. Jost and Jim Sidanius, Political Psychology, 4428 (#corroborates, via linked claim)

Although inclusive categorization is recognized by both Allport and the Common Ingroup Identity Model, Allport may have underestimated the important mediating role of perceived common group membership. Allport was aware of the benefits of common group membership, but he seemed to regard it as a catalyst rather than as a consequence of favorable contact conditions. While team membership may indeed facilitate the beneficial effects of contact, our model also suggests that unifying perceptions may be a consequence of cooperative, self-revealing interactions. Indeed, we propose that the perception of common ingroup identity is psychologically instrumental to bringing outgroup members closer to the self, thereby increasing positive orientations toward them. — John F. Dovidio, Peter Glick, Laurie A. Rudman, On the Nature of Prejudice, 583 (#exemplifies, via linked claim)

Coming together to gain access to land initiated the process of becoming commoners. In land occupations, settlers forged identity through shared struggle over time (Stavrides, 2022). In market-based settlements, common identity emerged from shared backgrounds (having lived and worked in similar areas) and their shared goal of gaining land. Benyei et al. found that shared identity can be the foundation for collective action, especially when “more formal means or institutions” are absent or in response to “feeling collectively disadvantaged” (2022, p. 272). — Jessica Carrick-Hagenbarth, Institutional Bricolage and Commoning…, 133 (#expands, via linked claim)

Categorization

• corroborated: 5 independent passages support this claim
• XREF: connects to: Observing others’ behaviour shapes one’s own behaviour most when shared identity is high. — John Drury, The role of social identity processes…, 131; Collective identity and shared grievances reinforce each other bidirectionally — John T. Jost and Jim Sidanius, Political Psychology, 4428; People act together because shared identity lets each expect others will join — John Drury and Rupert Brown and Roberto González and Daniel Miranda, Emergent social identity and observing…, 130 (+3 more)

Related

• Collective identity and shared grievances reinforce each other bidirectionally (similarity 0.89)
• Shared identity underpins commoner formation and collective action. (similarity 0.87)
• Common ingroup identity is a consequence of contact, not just a catalyst (similarity 0.86)
• Shared identity generates expectations of support and trust among group members (similarity 0.85)
• People act together because shared identity lets each expect others will join (similarity 0.82)
• Intergroup relations begin when people adopt collective rather than personal identity (similarity 0.82)
• Observing others’ behaviour shapes one’s own behaviour most when shared identity is high. (similarity 0.82)
• Shared identity in crowds produces solidarity and expected mutual support. (similarity 0.82)
• Ingroup-outgroup pairing, not either alone, drives identity shifts (similarity 0.81)
• Recognizing subgroup identities within a shared team identity reduces intergroup bias. (similarity 0.81)
• Collective identity shifts personal goals toward the group’s welfare (similarity 0.80)
• A common group identity mediates contact’s bias reduction rather than merely aiding it (similarity 0.80)
• Shared identity with a crowd increases helping and decreases pushing others aside. (similarity 0.80)
• Conscious social identity can change while influences stay unconscious (similarity 0.79)
• Shared identity can be an outcome of mutual aid, not only its cause (similarity 0.79)

Broader Connections

• Collective identity and shared grievances reinforce each other bidirectionally #corroborates (0.85) — John T. Jost and Jim Sidanius, Political Psychology, 4428
• Shared identity underpins commoner formation and collective action. #expands (0.80) — Jessica Carrick-Hagenbarth, Institutional Bricolage and Commoning…, 133
• Common ingroup identity is a consequence of contact, not just a catalyst #exemplifies (0.80) — John F. Dovidio, Peter Glick, Laurie A. Rudman, On the Nature of Prejudice, 583
• People act together because shared identity lets each expect others will join #expands (0.78) — John Drury and Rupert Brown and Roberto González and Daniel Miranda, Emergent social identity and observing…, 130