1Regional assortment diversity: rarefied entropy (mean over 2 000 draws of 15 stores; bars = 2.5–97.5 percentiles of the draws) and merchant-equal entropy on all stores; 16 regions with ≥ 15 stores (Nord-du-Québec, 3 stores, omitted). Source: Fabri-Ka research snapshot (2026-11-01), author's computations.