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As of 2026, Highline Beta argues that innovation teams should conduct early market sizing before validation experiments to make fast, directional assessments of whether a concept is worth pursuing further.
Innovation teams face a critical decision point after ideating a concept: determining whether it merits further investment before moving to validation or prototyping. Highline Beta recommends a five-step early market sizing approach that evaluates customer count, market value through TAM and SAM calculations, and growth rates to create a rational filter for concept prioritization. The framework scores markets as poor (less than $100M with under 2% growth), acceptable ($100M-$1B with 3-7% growth), or excellent (over $1B with above 7% growth) to guide go/no-go decisions when pivoting costs are still low.
The five steps are: define the hypothesized customer by identifying who experiences the problem, who purchases solutions, and their geographic location; estimate the raw count of potential customers in the target market; calculate market value using TAM (total global market) and SAM (serviceable addressable market based on geographic or regulatory constraints); assess market growth using CAGR to determine if it's growing, flat, or shrinking; and evaluate whether the market merits advancement using scoring criteria that range from poor to excellent based on size and growth metrics.
TAM is calculated by multiplying the number of global potential buyers by their estimated annual spend on the relevant category—for example, 10 million dental clinics spending $5,000 annually on software equals a $50 billion TAM. SAM represents the portion of TAM you can realistically serve based on geography or regulatory constraints, such as focusing only on the US portion of a global market. SAM typically serves as the most important number for early-stage innovation work to determine if the market is large enough for your goals.
Markets worth entering typically grow at 3 percent or more annually, ideally above 5 percent, as measured by CAGR from sources like Statista or IBIS World. The framework scores excellent markets as having more than $1 billion in annual revenue with over 7 percent growth, acceptable markets as $100 million to $1 billion with 3-7 percent growth, and poor markets as less than $100 million with under 2 percent growth. Growing markets signal demand, investment, and momentum, while shrinking or stagnant markets are harder and slower to build in.
Early market sizing provides a rational, evidence-based filter for concept prioritization when the cost of pivoting is very low but the cost of validating something too small is very high. This approach creates three critical outcomes: a systematic method for choosing which concepts deserve further investment, shared understanding of the likely customer base, and a baseline financial picture to support the next phase of validation research. Teams build confidence that the market is worth their time without needing to create detailed financial models at this early stage.
Once a concept emerges from initial secondary and primary problem research, the natural question is simple: is this worth pursuing?
Before investing time in validation experiments or prototyping, we recommend early market sizing which gives you a fast, directional assessment of opportunity size and momentum.
You are not trying to forecast revenue. You are deciding whether to invest further.
Below is the approach we use with corporate innovation teams to assess whether a concept is worth pursuing.
Before sizing anything, you need to know who the market represents.
At this stage you are not validating the customer yet. You are stating a hypothesis that guides the math.
You can frame this in three parts:
For example, if the concept is designed for independent insurance agencies, the buyer is the principal or operations manager. The user might be producers or administrators. In some B2B markets these roles are the same. In others, they are not.
You need this clarity because your stakeholder count and market value calculations depend entirely on who you believe will pay.
This is the simplest input and one of the most important. You are answering one question: How many potential customers exist in the market I want to serve?
This is not TAM yet. This is the raw count of estimated customers.
Examples:
The goal is not perfection. It is directional scale.
If your market contains only 8,000 potential buyers, that may be enough for an enterprise SaaS venture.If it contains 200, it probably is not.
At the concept evaluation stage, you only need two levels of sizing.
TAM (Total Addressable Market) This is the total theoretical market value if you served every possible buyer globally.
We calculate TAM by multiplying:
Number of global potential buyers x Estimated annual spend on the relevant category
Example: If there are 10M dental clinics globally, and it is estimated they spend $5,000 on software annually, the dental clinic software TAM is $50B dollars.
SAM (Serviceable Addressable Market) This is the portion of the market you can realistically serve based on geography or regulatory constraints.
Example: If your solution will launch in the United States first, then SAM is the US portion of the TAM.
SAM is typically the most important number in early stage work. It helps answer the question: Is this market large enough for our innovation goals?
You do not need SOM yet. That comes later when you have a business model and validated pricing.
Growth rate matters as much as size. A market worth entering is usually growing at 3 percent or more per year, and ideally above 5 percent.
CAGR tells you whether you are entering a rising tide, a flat line, or a shrinking space. Shrinking or stagnant markets are possible but harder and slower to build in. Growing markets signal demand, investment, and momentum.
You are not looking for precision here. You are looking for a strategic signal.
Where do you find CAGRs? Typically market research companies like Statista or IBIS World have publicly available CAGRs and TAMs for a variety of markets.
You now have three pieces of information:
Taken together, they help you make a fast go or no go decision.
In early venture development phases, the cost of pivoting is very low. The cost of validating something too small is very high.
We use the following framework to assess the market size of a concept by scoring it against the following criteria:
Poor: Market size is small (less than $100M in annual revenue) with low growth (less than 2%/yr)
Acceptable: Market size is medium ($100M - $1B in annual revenue) with moderate growth (3-7%/yr)
Excellent: Market size is large (More than $1B in annual revenue) with high growth (more than 7%/yr)
This early stage sizing creates three important outcomes:
You are not building financial models yet. You are building confidence that the market is worth your time.
