The paper is a scholarly comment on Dasgupta and Goyal’s (2019) model of “narrow identities”. It begins by situating identity in a long‑run historical perspective, emphasizing that human identities are inherently multidimensional (ethnicity, gender, class, religion, etc.) and that the emergence of narrow identities—where one dimension dominates and the rest are effectively switched off—is an extreme, conflict‑prone phenomenon. The author illustrates this with a personal anecdote from the 1983 Sri Lankan riots, showing how a complex, self‑chosen identity can be collapsed into a single ethnic label under violent pressure. The comment then reviews the Dasgupta‑Goyal (DG) model, which treats identity formation as a club‑type game with two groups (A and B) and shows that narrow identities arise as an equilibrium when groups impose negative externalities on each other and leaders restrict dual membership. The author relates this to the religious‑club literature, noting that DG focuses on inter‑group externalities and the extensive margin of membership. Building on DG, three extensions are proposed: (1) making identity explicitly multidimensional, (2) allowing ex‑ante heterogeneity among individuals, and (3) redefining narrow identity using a weighted‑distance metric and entropy of the weight vector. A formal definition is given: each individual i has an identity vector xi and a personal weight vector θi over dimensions; narrowness corresponds to most weight on a single dimension, measurable by low entropy. The paper then sketches two positive‑feedback pathways that can drive a society from broad to narrow identities. The first, “intergroup dynamics”, mirrors the DG mechanism: harmful actions between groups increase the weight on the contested dimension, reinforcing conflict and leading to exclusive group membership. The second, “intragroup dynamics”, describes cult‑like processes where within‑group interaction raises the weight on a rare shared trait, producing a tightly knit, narrowly identified group that may be non‑violent but can become violent under certain conditions. The comment concludes that DG’s model is a valuable step but that future work should incorporate multidimensionality, heterogeneity, and dynamic feedbacks both between and within groups to better understand and ultimately mitigate identity‑based conflict.
Topics
Multidimensional Identity and the Phenomenon of Narrowing
Explains that human identities consist of many dimensions (ethnicity, gender, class, etc.) and that narrow identities arise when one dimension dominates, collapsing the rest.
Review of Dasgupta‑Goyal’s Club‑Model of Narrow Identities
Summarizes DG’s equilibrium model with two groups, membership choices, and the role of negative inter‑group externalities and leader‑imposed membership restrictions.
Proposed Multidimensional Formal Definition of Identity (Weighted Distance & Entropy)
Introduces a vector representation of identity, a weighted perceived distance metric, and entropy as a measure of narrowness.
Extensions to the DG Model: Heterogeneity and Multidimensionality
Suggests three avenues for extending DG: explicit multidimensional identities, ex‑ante heterogeneity among agents, and a new narrow‑identity definition.
Intergroup Dynamics Path to Narrow Identities
Describes a feedback loop where harmful actions between groups increase the weight on the contested dimension, leading to exclusive group membership and conflict.
Intragroup (Cult) Dynamics Path to Narrow Identities
Shows how within‑group interaction around a rare trait can raise its weight, creating a tightly bound, narrowly identified group, potentially evolving into a cult.
Implications for Economic Theory and Conflict Mitigation
Discusses how incorporating multidimensional, dynamic identity models can enrich economic analysis of identity‑based conflict and inform policy interventions.