What is Market Sizing?
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Market sizing is traditionally defined as estimating the number of buyers of a particular product, or users of a service.
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Market Sizing Methodology
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Defining the Market
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Who's the buyer?
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Who's the user? (yes, it can be different from the buyer)
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What is the scope of my market (geographically and/or demographically)?
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Identify the target industry
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Research potential competitors
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Research potential competitors by looking for reported numbers in financial analyst reports (i.e. number of customers reported by competitors, market share, revenue)
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Compile both competitor revenue and number of customers.
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Questions to ask when sizing the market
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Does the market consist of business (B2B) or consumers (B2C)?
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Does the market organize itself by product, by segment, geography, or other?
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What is the total market size (Total Addressable Market - TAM), the portion of TAM which your company's product and/service address (Serviceable Available Market - SAM), and the portion of SAM which your company can capture besides your competitors (Serviceable Obtainable Market - SOM)?
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