Which statement is true about TAM, SAM, SOM?

• A. All three metrics are different ways to define the market and help frame scale.
• B. SOM is the entire market demand.
• C. Only TAM is useful for planning growth.
• D. SAM and SOM are synonyms for TAM.

Answer: (A)

TAM, SAM, and SOM are market size estimates that help you understand how big the opportunity is and how feasible it is to capture it. The total addressable market represents the overall demand if every potential customer worldwide could use your product or service, assuming no constraints. The serviceable available market narrows that further to the portion you could actually reach with your current product, business model, and geographic focus. The serviceable obtainable market tightens it again to what you can realistically capture in the near term given competition, resources, and go-to-market strategy.

So why the statement is the best: these metrics aren’t just different numbers; they’re different lenses on scale that you use together to plan growth. They start from the broadest possible opportunity and progressively filter down to what’s realistically attainable, which helps you set ambitious yet credible goals and allocate resources accordingly.

Why the other ideas don’t fit: SOM is not the entire market demand; it’s the realistic share within the serviceable market you can obtain. Only focusing on TAM ignores practical constraints and underestimates the planning you need for growth. And SAM and SOM aren’t synonyms for TAM—the three are nested estimates, each representing a closer, more actionable slice of opportunity.