Type-level market taxonomy distinguishes Interferon-ฮฑ, Interferon-ฮฒ, and Interferon-ฮณ, each linked to distinct receptor subunits and therapeutic outcomes. Interferon-ฮฑ (ropeginterferon alfa-2a, peginterferon alfa-2b) dominates volume (>45%) because of entrenched hepatitis regimens; average selling prices have fallen 40% since 2018 due to biosimilar erosion, yet volume elasticity partially offset revenue decline. Interferon-ฮฒ generates the highest per-unit price, exceeding USD 12,000 per patient-year in MS, translating into the largest share of market value (~38%). Pegylation and glycoengineering extensions have lengthened half-life, reducing dosing frequency to once every two weeks and supporting adherence. Interferon-ฮณ, though smallest (<10% share), is indispensable for chronic granulomatous disease and osteopetrosis, indications where no approved substitutes exist, allowing manufacturers to maintain >70% gross margins despite limited patient pools. Moving forward, next-generation controlled-release formulations and long-acting mutants are expected to redraw competitive boundaries within each type segment.