Control points sit with regulators (GMP certificates, periodic safety update reports) and payers (formulary inclusion), while manufacturers depend on a limited pool of API suppliers, creating single-source risk. High regulatory switching costsโbioequivalence re-studies, stability batches, and dossier updatesโdeter rapid supplier substitution, and cross-territory reference pricing compresses margin differentiation. The ecosystem therefore rewards long-term API supply agreements, integrated pharmacovigilance systems, and early payer engagement; regional variation arises from divergent reimbursement pathways, with tender markets emphasising lowest compliant bid and insurance markets emphasising real-world outcome data.