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TAM: The entire revenue opportunity if you had 100% market share. For Indian fintech: ~Rs 6 Lakh Crore by 2030 (BCG-FICCI estimate).
SAM: The portion of TAM your specific product/segment can serve. For a digital lending platform targeting salaried professionals: ~Rs 50,000-80,000 Crore.
SOM: The realistic share you can capture in 3-5 years. For a Series A fintech: 0.5-2% of SAM = Rs 250-1,600 Crore.
High-opportunity signals:
Red flags:
FAQs about Market Opportunity Score
Large TAM (Rs 5000 Cr+), high growth (20%+), limited competition, manageable regulation, and ability to build defensible positioning. The best markets have tailwinds (technology, regulation, behavior shifts) that make timing favorable.
Critical. Being too early is as bad as too late. The best timing: infrastructure ready (payments, internet penetration), regulation enabling (not blocking), customer behavior shifting, but large incumbents not yet focused. India fintech in 2016-2020 was perfect timing.
Only if you have genuine differentiation. In markets with 20+ competitors, you need either: radically better product, dramatically lower cost structure, unique distribution, or an underserved niche that others ignore.
Regulation creates both barriers and moats. High regulation raises entry costs (bad for starting) but protects incumbents (good once you are in). RBI licensing in lending is a barrier to entry but also a competitive moat for licensed NBFCs.
Below 10%: mature, share-stealing required. 10-20%: growing, can grow with market. 20-30%: fast-growing, rising tide lifts boats. 30%+: explosive, land-grab dynamics. For startups, 20%+ market growth is ideal because it forgives execution mistakes.
Use TAM for this scorer to evaluate overall market attractiveness. Then narrow to SAM for business planning. A huge TAM with tiny SAM might still be attractive if SAM can expand over time.
Annually at minimum. Markets shift. New competitors enter, regulations change, technology evolves. What scored 80/100 two years ago might be 50/100 today if three well-funded competitors entered.