Why do domestic amoxicillin capsules from different manufacturers vary so much in price?

Why do domestic amoxicillin capsules from different manufacturers vary so much in price?
Price gaps in Chinese amoxicillin capsules stem largely from upstream concentration and downstream branding. The 6-APA intermediate market is dominated by five producers, with United Laboratories holding over 40% share; 2021 quotes ranged from 140 to 240 yuan/kg. Amoxicillin API capacity is similarly concentrated among Inner Mongolia United, Changsheng, CSPC Weiqida, Zhuhai United, NCPC and Lukang, together exceeding 85% of supply. At the formulation stage, brand-name players like Baiyunshan, United Laboratories and Hkpf invest in marketing and packaging, pushing retail prices to 30-40 yuan per box, while generic producers such as Lukang sell equivalent 0.25g capsules for as little as 3-5 yuan. National quality standards mandate identical active ingredient content, impurity limits and dissolution rates, so therapeutic equivalence is assured regardless of price point.