TAM, SAM and SOM explained with mangoes: The missing Market founders should measure

Learn TAM, SAM and SOM through a mango garden analogy, plus LAM, a practical market sizing framework for the customers your startup can reach at launch.

A founder can show a ₹10,000 crore market and still struggle to answer a much smaller question. Who can I sell to first? That gap between market potential and market access is where many TAM, SAM and SOM calculations become less useful than they appear.

The TAM, SAM and SOM framework is one of the most common ways to explain market size in startup pitch decks, business plans and investment discussions. The basic logic is sound. Start with the total opportunity, narrow it to the market you can serve, then estimate what you can realistically capture. The challenge is deciding what belongs inside each layer and explaining why the numbers shrink.

Mangoes make that problem surprisingly easy to see. If we treat the market as a world of fruit, every filter becomes physical. Some fruit belongs to the wrong category. Some mangoes fail your selection criteria. Some sit behind walls or across streams. Some hang too high. Some are being picked by competitors. Some are within reach today. That gives us a practical way to understand TAM, SAM and SOM and to introduce one additional launch-stage idea called LAM, or Launch Addressable Market.

For clarity, TAM stands for Total Addressable Market. SAM is commonly expanded as Serviceable Addressable Market or Serviceable Available Market. SOM stands for Serviceable Obtainable Market. This article keeps those familiar terms and adds LAM, or Launch Addressable Market, as a proposed launch-stage extension.

Welcome to the world of Mangoes

Imagine that you like mangoes and have arrived in a region filled with fruit farms. Around you are apples, bananas, oranges, guavas, grapes, papayas and dozens of other fruits. Some are attractive. Some may even be cheaper or easier to find. Your interest, however, is specific. You are here for mangoes.

That simple choice is a useful way to understand startup market sizing. The economy contains an enormous number of people, organizations, needs and transactions. A business operates inside a much narrower economic space created by the problem it solves, the product it offers and the customers for whom that offering is relevant.

TAM, SAM and SOM are designed to make that narrowing visible. Yet the familiar circles often hide the reasoning that matters. The mango garden gives us a physical way to see each market boundary. Every reduction happens because a customer fails a qualification test, sits outside the area the business can serve, becomes difficult to win, or remains beyond the founder’s immediate reach.

All the Fruits in the World: The entire population

Start with every fruit in the region. If we were to count apples, oranges, bananas, grapes, guavas, mangoes and everything else, we would have a huge population. In business terms, this represents the broad universe of people or organizations that could participate in economic activity. It is useful context, although it tells us very little about the market for one particular offering.

A person who buys food is part of the consumer population. That fact alone is insufficient to place the person in the market for premium running shoes, enterprise accounting software or cardiac imaging equipment. A company may have employees, revenue and a technology budget while having no reason to buy a specific logistics platform. Existence, purchasing power and broad category participation are too loose to define a useful market.

The fruit population is therefore the widest possible universe. It is the place from which market definition begins. We need a sharper choice before the numbers become commercially useful.

You want Mangoes: Defining your Industry

You decide that mangoes are the category that interests you. There are mango plantations across the region. Some are small family orchards. Some are large commercial farms. Different plantations grow different varieties. The category is broad, yet it is already far more relevant than the universe of all fruit.

Mangoes represent the industry or broad business category. If you are building payroll software, the equivalent may be business software. If you are selling diagnostic equipment, the equivalent may be medical devices. If you are launching a packaged snack, the equivalent may be packaged foods. The industry helps define where you are playing, although it still contains many customers and products that may have little connection with your particular offer.

This distinction prevents a common market-sizing error. Founders sometimes begin with a very large industry number because the number is easy to find and impressive to display. The industry provides context. The market for one company requires a narrower customer definition.

Defining the Mango you actually want: Defining your Target Market

Now your preferences become more specific. Perhaps you want a particular variety of mango. You want fruit within a certain size range and at a particular stage of ripeness. You want healthy fruit that is still on the tree. Rotten mangoes are excluded. Mangoes with worms are excluded. Fruit that has fallen and spoiled is excluded. A mango that has already been partly eaten by an animal is also outside your selection.

These criteria represent the way a business defines its target customer. In a consumer market, the criteria may include age, income, location, lifestyle, behavior, preferences, purchasing power or a specific need. In a business market, the criteria may include industry, company size, revenue, number of locations, technology stack, regulatory status, purchasing process or the severity of a problem.

Psychographics can matter as much as demographics. Two customers of the same age and income can respond very differently to the same product because their priorities, habits, attitudes or willingness to change are different. Two companies of the same size can have very different buying behavior because one has an urgent operational problem and the other is satisfied with its current process.

The selection criteria should come from the offering. If a product is designed for a specific type of user, the market should reflect that specificity. A loose definition may create a larger number while weakening the usefulness of the calculation. A well-defined target profile gives the rest of the market-sizing exercise a stable foundation. Some criteria also change with time. If ripeness represents purchase readiness, the resulting market estimate should be tied to a defined period because a customer outside today’s qualified market may enter it later as circumstances change.

Understanding TAM, SAM and SOM through the Mango Garden

Once the mango criteria are clear, we can begin the TAM, SAM and SOM market sizing exercise. The terminology is used with small variations in practice, so this article uses explicit definitions throughout. In this framework, TAM begins with fit. SAM introduces serviceability. SOM introduces realistic capture over a defined period. Each layer answers a different commercial question.

Consider one continuous illustration. Assume that the wider mango industry in our chosen region contains 10 million mangoes. The number is intentionally simple because the purpose is to understand the logic. As we apply each filter, the number will fall only when a real condition removes part of the opportunity.

TAM: Which mangoes actually fit?

Across all the plantations, only some mangoes meet your criteria. Many belong to another variety. Some are too raw. Some are overripe. Some are damaged or spoiled. After applying the criteria, suppose one million mangoes remain. These one million mangoes form the Total Addressable Market in this model.

The important point is that the qualifying mangoes may be spread across several plantations. Some may be close to you and some may be far away. Some may eventually be difficult to reach. Their location leaves the target fit unchanged. TAM is being defined by customer qualification before we apply constraints created by the business itself.

In business terms, imagine a software product designed for multi-location retailers that meet specific operating conditions. A large national chain may qualify. A regional chain may qualify. A retailer in another state may qualify as well. If they all match the customer profile and the offering is relevant to them, they belong to the addressable demand represented by TAM, even if the startup cannot currently sell to every one of them.

This approach also keeps the TAM from becoming an industry headline. A broad software industry may be worth billions while only a fraction of that demand is relevant to one product. The TAM should emerge from the customers and demand that match the actual offer. In the mango example, the 10 million industry mangoes are context. The one million qualifying mangoes are the addressable market defined by fit.

SAM: Which qualifying mangoes can you serve?

Now the terrain begins to matter. Some of the one million qualifying mangoes are in plantations behind a wall. Others are across a stream. Some are far beyond the area you can currently cover. The mangoes still meet every quality criterion. The limitation comes from your ability to operate where they are.

Those physical barriers represent serviceability constraints. A wall can stand for a regulatory boundary or a market where the company lacks permission to operate. A stream can represent a distribution barrier. Distance can represent geography, logistics or the absence of a sales and support network. A technology constraint may prevent the product from working with a customer’s existing systems. A language or compliance requirement can create another boundary.

Suppose the current business model can genuinely serve 300,000 of the one million qualifying mangoes. The remaining 700,000 still belong to the broader TAM. They sit outside the present Serviceable Available Market because the company cannot serve them under its current operating conditions.

The distinction becomes useful when strategy changes. If the company receives a regulatory approval, builds a distribution partnership or launches a compatible product version, some customers can move from outside SAM into SAM. The customer fit was already present. The company removed a serviceability constraint.

SOM: Which mangoes can you realistically win?

You can now enter the plantations that contain 300,000 qualifying and serviceable mangoes. Access to the plantation still leaves the capture question open. Some fruit hangs high on the tree. Some branches require ladders or harvesting equipment. Other people are already picking. They may have more workers, better tools, stronger relationships with the plantation owner or years of experience.

This is where realistic capture enters the calculation. A business competes for customers. It also operates with limited sales capacity, marketing budget, brand recognition, production capacity, working capital and management attention. Even when a customer can be served, there must be a credible path to winning that customer.

Assume that, based on competition, sales capacity, capital and execution, the business could reasonably capture 30,000 of the 300,000 serviceable mangoes over the next three years. Those 30,000 represent the Serviceable Obtainable Market for that stated horizon. The three-year period matters because realistic capture changes with time.

SOM is therefore a strategic estimate built from capture conditions. It should be supported by customer acquisition capacity, conversion assumptions, competitive conditions, route to market and the organization’s ability to deliver what it sells. A 10 percent SOM may be reasonable in one market and absurd in another. The percentage becomes meaningful only after the operating logic has been established.

The missing question for Early Stage Startups. Where do you actually start?

The conventional TAM, SAM and SOM framework takes us a long way. For an early-stage startup, SOM can still sit too far into the future to guide the next few weeks or months. A three-year obtainable market of 30,000 customers may be credible and still leave the founder unsure about the first 50, 100 or 500 customers to approach.

That gap leads to the proposed Launch Addressable Market, or LAM. LAM is the commercially relevant portion of the obtainable market that a startup can immediately reach, serve and learn from using the resources, relationships, channels and capabilities available at launch. It adds a present-time constraint to market sizing.

LAM is proposed here as a practical extension for launch-stage and validation-stage thinking within this article. Its value lies in forcing an early-stage company to connect market opportunity with current access.

You have just entered the Garden

Return to the mango plantation. You have just arrived. There is no harvesting machine waiting for you. You may have no employees. You may not own a ladder. You may not even have a vehicle. You have your hands, your time, a basket and whatever relationships or permissions helped you enter the garden.

The 30,000 mangoes in SOM remain strategically obtainable over three years. Your first day looks very different. Future resources may include a larger team, better tools and more capital. Launch decisions have to be made with the capability available now.

This present-state view matters during validation because learning depends on contact with real target customers. A theoretical market produces no direct feedback. A reachable customer can use the product, reject it, pay for it, complain about it, recommend it or reveal that the problem was framed incorrectly.

How far can you walk?

Suppose the plantation is large and you have no vehicle. You can only walk a reasonable distance during the day. A cluster of suitable trees may exist several kilometers away, yet reaching them repeatedly is impractical at the moment. Trees near your current position are easier to approach, inspect and revisit.

In a startup, walking distance represents immediate market reach. It may be the geography the founders can personally cover. It may be a professional network, an existing client base, a university community, a distributor relationship or a sales channel that already exists. These routes reduce the cost and time required to reach the first customers.

Immediate reach is especially valuable when the objective is validation. A founder can learn faster from ten relevant customers who can be contacted this week than from ten thousand relevant customers who require months of channel development before a conversation can begin.

What can you reach with your hands?

Even among nearby trees, many mangoes hang above your reach. A ladder would solve the problem. A harvesting pole would solve another. Machinery could change the economics entirely. Those tools belong to the future unless you already possess them.

The equivalent in business is current capability. A customer may require an enterprise security certification that the startup has yet to complete. Another may require integration with a system the current product does not support. A large customer may demand a procurement process, service-level commitment or support capacity beyond the startup’s present capability.

These customers can still sit inside SOM if the required capabilities are realistic within the strategic horizon. They may remain outside LAM because the capability is unavailable at launch. The distinction helps founders separate a believable future path from an executable present action.

How big is your basket?

Reach is only one constraint. Suppose there are 2,000 perfect mangoes hanging low on nearby trees. Your basket can carry fifty. Collecting more than fifty creates another problem because the fruit has to be stored, transported and used before it spoils. Access without capacity can create its own form of failure.

The basket represents operating capacity. A startup may be able to attract hundreds of early users while having the support capacity to onboard only fifty properly. A consulting company may generate twenty promising leads while having delivery capacity for six new clients. A manufacturer may receive orders that exceed available working capital or production capacity.

LAM therefore has to consider both acquisition and service. A launch market of 500 customers makes little sense if the company can responsibly onboard only 40 during the launch period. The market may be reachable while the organization remains unable to absorb it.

The nearest right Mango

Easy access can also mislead. The nearest mango may be rotten. It may be the wrong variety. It may be so unusual that learning from it tells you very little about the wider market. The useful launch customer is the nearest right mango, meaning a customer who fits the target definition and can also be reached and served under current conditions.

Friends, family and convenient contacts can produce weak validation when the relationship drives their willingness to try the product. Their feedback can still be useful. Evidence from the intended market carries more weight because it reflects the conditions under which the business ultimately has to sell.

For this framework, LAM can be defined as the commercially relevant portion of SOM that a startup can immediately reach, serve and learn from using its current resources, channels, relationships and capabilities. In our continuous illustration, suppose 500 mangoes meet that condition during the first launch phase. Those 500 form the Launch Addressable Market.

Putting the TAM, SAM, SOM and LAM market sizing model together

The mango model now forms one continuous market sizing sequence. The world of fruit gives us the population. Mangoes give us the industry. The defined mango criteria create the target customer profile. TAM counts all qualifying mangoes. SAM applies serviceability. SOM applies realistic capture over a strategic horizon. LAM applies immediate launch access and capacity.

From all Fruits to LAM

The logic can be written as Population → Industry → Fit → Serviceability → Realistic Capture → Immediate Access. The nesting is LAM ⊆ SOM ⊆ SAM ⊆ TAM. Each layer sits inside the previous one because another commercial constraint has been added.

Market size can be expressed as customer count, unit volume or revenue value. The measure should remain consistent within a calculation, and the assumptions behind any conversion into revenue should be visible. Customer count is especially useful in this article because it keeps each filter easy to trace.

This relationship is useful only when the boundaries are explained. A diagram of concentric circles can make the hierarchy look precise even when the underlying estimates are arbitrary. The reasoning behind the boundary matters more than the visual neatness of the circles.

One complete TAM, SAM, SOM and LAM calculation

Consider the same illustrative mango market from beginning to end. The wider mango industry contains 10 million mangoes. One million match the selection criteria and form TAM. Of those, 300,000 sit inside areas the current business can genuinely serve and form SAM. Competition, sales capacity, capital and execution reduce realistic three-year capture to 30,000, which becomes SOM. During the launch period, only 500 can be reached, acquired and served with current resources. Those 500 form LAM.

Notice that the numerical reductions happen for different reasons. Nine million mangoes fall outside TAM because they fall outside the target profile. Seven hundred thousand qualifying mangoes sit outside SAM because the current business lacks serviceability in those locations or conditions. Most of the remaining 300,000 sit outside SOM because competition, capacity and execution make full capture unrealistic. Only 500 enter LAM because launch-stage access and capacity are much narrower than the three-year strategic potential.

Why every reduction needs a reason

A useful market-sizing model should allow a reader to challenge every reduction. If TAM falls from one million to a SAM of 300,000, the founder should be able to identify the barriers responsible for excluding 700,000. If SOM is 30,000, there should be a credible explanation based on acquisition capacity, competitive position, sales productivity, time and delivery capacity.

The same discipline applies to LAM. A founder should be able to identify where the first 500 customers are likely to come from, how they can be reached, why they fit the target profile and whether the company can serve them well enough to learn from the experience. A launch market becomes useful when it can be translated into actual customer lists, channels and conversations.

This turns market sizing into a chain of assumptions that can be tested. Some assumptions will prove too optimistic. Others may be unnecessarily conservative. The model becomes more accurate as real evidence replaces estimates.

From Mangoes to a real startup market sizing example

A metaphor is useful only if it survives contact with a real business problem. Consider a hypothetical B2B SaaS startup that sells inventory and replenishment software to multi-location retailers in India. The company charges an annual subscription and requires customers to have digital point-of-sale data that can be integrated with the platform.

The example is fictional. The customer counts and revenue figures are illustrative so that the logic can be examined without pretending to use verified market data. In a real market-sizing exercise, each number would have to be supported by reliable market research, company databases, sales evidence or other appropriate sources.

A B2B SaaS Market sizing example

Begin with the industry. India contains a very large number of retail businesses, but the startup is not targeting every retailer. Its customer profile is narrower. Assume the product is designed for organized retail companies with 5 to 50 outlets, centralized purchasing, digital billing, enough transaction volume to benefit from automated replenishment and a software budget that can support an annual subscription of ₹120,000.

Suppose verified market research later shows that 20,000 companies meet those criteria. Under this framework, those 20,000 companies form the TAM because they fit the defined customer profile. At ₹120,000 per year, the annual revenue opportunity represented by TAM would be ₹240 crore. The calculation is 20,000 customers multiplied by ₹120,000 per customer per year.

Now introduce serviceability. Assume the startup currently supports only two billing systems, sells in regions where its implementation partners operate and provides support in English and Hindi. Once those constraints are applied, only 6,000 of the 20,000 qualifying companies can be served under the current model. The annual revenue opportunity represented by SAM would therefore be ₹72 crore at the same price point.

SOM requires a different type of reasoning. The startup has six salespeople, a limited marketing budget, two established competitors and an implementation process that currently supports a finite number of new accounts each month. Based on a bottom-up sales plan, account capacity and realistic conversion assumptions, management estimates that 1,200 customers could be won over three years. At the same annual subscription, that customer base would represent ₹14.4 crore in annual recurring revenue if all 1,200 were active at the full subscription level at the end of the period.

LAM looks at the launch period. The founders have direct access to one retail association, relationships with several regional retailers and an outbound list of companies using the two supported billing systems. After checking fit and onboarding capacity, they identify 100 companies that can be reached and properly served during the first six months. Those 100 companies form the initial LAM. They form a launch pool and remain separate from the revenue forecast because conversion still has to occur.

This distinction is useful for execution. The TAM tells management that the customer profile supports a substantial opportunity. SAM identifies the portion the current product and operating model can serve. SOM connects that opportunity to a three-year commercial plan. LAM gives the team a concrete pool for immediate validation, selling and learning.

What the Mango Garden represents in Business

The physical features of the mango garden can be translated into specific business constraints. Keeping the mapping consistent helps prevent the metaphor from becoming decorative. Each object should represent a constraint that changes access or capacity.

Turning Mango Garden Constraints into business constraints

The mapping also shows why different investments expand different parts of the market. A new compliance approval can remove a wall and expand SAM. A distribution partner can create a way across the stream. A new product integration can function like a ladder by making previously difficult customers reachable. Additional capital or automation can increase the number of customers the company can acquire and serve within the same period.

Competition behaves differently. Another picker can compete for a mango while the mango remains serviceable. Competition affects the probability of capture, which is why it belongs mainly in the reasoning around SOM. A strong competitor may also increase acquisition cost or force the company to focus on a narrower segment where it has a better chance of winning.

Capacity has its own effect. A company can have excellent demand and still damage its position by taking on more customers than it can serve. The basket analogy keeps this operational reality inside the market conversation. Market access becomes economically useful only when the business can deliver the promised value.

Stop calculating TAM, SAM and SOM backwards

A familiar startup market sizing slide starts with a large TAM and then reduces it mechanically. A founder may show a TAM of ₹10,000 crore, assign 10 percent to SAM, assign 1 percent to SOM and move on. The arithmetic is clear. The commercial reasoning remains hidden.

Percentages can emerge from analysis, but they should come after the market boundaries have been established. If geography and product compatibility make 28 percent of qualified customers serviceable, SAM should reflect 28 percent. If a bottom-up sales plan supports a three-year capture of 3.6 percent, SOM should reflect 3.6 percent. Market sizing becomes useful when each percentage can be traced back to a real condition.

The problem with percentage based market sizing

Percentage reduction hides why customers are being excluded. A 10 percent SAM says little about geography, regulation, channel access, product compatibility or customer economics. Once those constraints are visible, the number becomes easier to test and the path to expansion becomes easier to understand.

Top-down market share can also disconnect SOM from organizational capacity. One percent of a huge market may still require thousands of customers, a large sales force, substantial working capital or distribution that has yet to be built. A small-looking percentage can describe an operationally ambitious outcome.

The same issue affects strategy. Different constraints require different responses. A regulatory wall calls for approval or a market-entry change. A distribution stream calls for a channel. A tall tree calls for new capability. A small basket calls for more delivery capacity. The calculation becomes strategic when the founder knows what is creating each boundary.

Define, Qualify, Serve, Capture and Launch

A more useful sequence starts with the customer and moves through operating reality. Define the customer profile. Qualify the people or organizations that genuinely match the offering. Determine which customers the current business can serve. Estimate which serviceable customers can realistically be captured during a stated period. Then identify the subset that can be reached and served during launch. This is also a practical way to approach how to calculate TAM, SAM and SOM without relying on arbitrary market-share assumptions.

The sequence can also support bottom-up revenue calculations. If N represents the number of qualified customers and ARPC represents annual revenue per customer, a simple TAM revenue estimate is N × ARPC. SAM uses the number of qualified customers that can actually be served. SOM uses the number the company can realistically capture in the chosen horizon. LAM can be expressed as a customer count and, where useful, as the revenue pool represented by the immediately reachable launch cohort.

The revenue pool should not be confused with a forecast. If a LAM contains 100 customers at ₹120,000 per year, the pool represents ₹1.2 crore of annual subscription value. The company may convert only a fraction of those 100 customers. Forecasting requires additional assumptions about conversion, timing, churn, discounts and ramp-up.

Why every market number needs evidence

Each layer should be supported by evidence appropriate to the question. TAM may rely on customer databases, industry research, public records, surveys or primary research that identifies how many customers meet the target profile. SAM needs evidence about service territories, product compatibility, regulation, channel coverage and operating capability. SOM needs sales productivity, competitive data, conversion rates, capacity and time.

LAM can often be made unusually concrete. Founders can build an actual list of launch customers, identify the route to each customer and estimate the number that can be contacted and onboarded within the validation period. The closer the exercise gets to launch, the less useful vague percentages become.

Evidence also improves the model over time. Early assumptions can be replaced with observed conversion rates, implementation times, average contract values and churn. The market map then becomes connected to the operating system of the business and gains value beyond an investor presentation.

How your Addressable Market expands as your Startup grows

A startup’s accessible market changes as the startup changes. The mangoes may have been present from the beginning, yet the founder’s ability to reach them increases with tools, people, capital, permissions, knowledge and reputation. Market sizing therefore becomes a moving picture that should be revisited as the company develops.

Today you have your hands

At launch, the founder may have little more than personal effort and a small basket. That is enough to begin if the nearest right mangoes can be reached. Early customers can provide evidence about willingness to pay, product use, onboarding difficulty, buying objections and the strength of the problem being solved.

The first market therefore has a learning function as well as a revenue function. A good LAM gives the startup access to customers who can produce evidence quickly enough to influence product and commercial decisions.

Tomorrow you get a ladder

A ladder changes what can be reached without changing the plantation. In business, the ladder may be a product integration, a certification, a new salesperson, a stronger case study or a channel partnership. Customers that were previously difficult can move into immediate reach.

Some capability improvements expand LAM while leaving the broader TAM unchanged. The target customer definition remains the same. The company simply becomes better equipped to approach and serve more of those customers.

Then you get a vehicle, people and machinery

A vehicle expands distance. Additional people expand the number of trees that can be visited. Machinery changes harvesting capacity. In a company, the equivalents may include geographic expansion, a larger sales team, automation, implementation partners, customer success capacity, working capital and production infrastructure.

These changes can alter SOM because the company can credibly capture more customers within the same strategic period. They can also alter SAM when the new capability removes a serviceability constraint. The effect depends on the type of constraint being removed.

Eventually you cross the wall

At some point the company may gain access to the plantation behind the wall. A regulatory approval may open a new country. A localization effort may support another language. A distribution agreement may open a customer segment that was previously inaccessible. The customers were already a good fit, and the business has now acquired the ability to serve them.

That change expands SAM. If the new market also contains customer types that were never part of the original target profile, the company may decide to redefine the target market and recalculate TAM as well. Market expansion can therefore happen through better access to the same customer or through a deliberate move into a new customer definition.

Market Size changes as Capability changes

This dynamic view creates a useful planning discipline. When management wants a larger market, it can identify the constraint that must be removed. Qualified customers outside current service capability point to a SAM constraint. Serviceable customers that remain difficult to win point to SOM. Customers that appear winnable over time but remain outside immediate reach point to LAM.

The model therefore connects market sizing with capability building. It can guide decisions about product development, distribution, hiring, capital, partnerships and geographic expansion. A larger market then emerges from specific capability changes and carries more substance than an optimistic assumption added to a pitch deck.

Start with the first Mango

TAM tells you which mangoes fit. SAM tells you which mangoes you can serve. SOM tells you which mangoes you can realistically win over a defined horizon. LAM tells you which mangoes you can start picking today. Together, the four layers connect market definition with immediate execution.

A billion mangoes may create an impressive headline. A startup still has to reach a real tree, choose the right fruit, pick it carefully and carry it home. The first customers expose assumptions that market reports leave unresolved. They show whether the product fits, whether the route to market works and whether the organization can deliver what it promises.

The value of the mango model lies in giving every market number a physical constraint and every reduction a reason. For an early-stage founder, a useful market map connects a large opportunity to the first real customer who can be reached, served and learned from. That first customer may sit inside a very large TAM, but the business begins with the nearest right mango.