The portion of the TAM a company can realistically target given its current business model, geographic reach, and go-to-market capabilities.
Deeper Explanation
While TAM is a theoretical ceiling, SAM is the practical near-term opportunity. A global payments company may have a trillion-dollar TAM but only a ₹10 billion SAM given its current geographies and customer segments. SAM is more useful for near-term growth modelling; TAM is more useful for long-term potential sizing. Exceptional growth companies expand their SAM over time by entering new markets, customer segments, or adjacencies — which is why Amazon grew from book SAM to general retail SAM to cloud computing SAM. The best growth investments are companies actively expanding their SAM through product innovation and geographic expansion.
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