Identify a mechanism decoupling concentration from community structure

Identify a missing mechanism that can decouple head-brand concentration from community structure in the independent-aggregation simulator without flattening the observed purchased-tier distribution.

Background

The repaired simulator remains inadequate because increasing the concentration exponent improves top-brand concentration at the cost of modularity and mean purchased tier. The authors therefore identify a structural tension that the current persona-reservoir generator cannot resolve through its existing parameters.

Possible mechanisms mentioned by the authors include correlated within-basket selection, store or platform exposure, social influence, and latent consumer stratification. The paper does not determine which, if any, resolves the joint discrepancy.

References

That residual converts into four concrete questions, each grounded in a specific result. Which missing mechanism can decouple head-brand concentration from community structure without flattening the purchased-tier distribution, correlated within-basket selection, store or platform exposure, social influence, or latent consumer stratification (the adequacy-diagnosis result, the repair result)?

— Testing, not presuming, adequacy: calibrating generative social simulators against emergent network structure  (2609.24012 - Shao et al., 21 Sep 2026) in Discussion, “Scope conditions, and the questions the residual opens”