wunder beta📘 How do market maps size opportunity?
Market sizing answers a strategic question before you spend a dollar: is this opportunity big enough to matter, and which slice can you realistically win? Investors use it to judge ambition; product leaders use it to choose where to play an
What you’ll learn
- Sizing the MarketDefine TAM, SAM, and SOM and construct a defensible market size using both top-down and bottom-up methods.Market sizing disciplines strategy by establishing whether an opportunity is large enough and which slice is winnable. TAM is the theoretical ceiling, SAM the reachable portion, and SOM the realistically obtainable share. Top-down sizing slices a published total by percentages and serves as a fast sanity check; bottom-up builds from reachable customers, price, and frequency and is usually more credible because its assumptions are explicit and testable. Best practice is to do both and triangulate, while avoiding pitfalls like equating TAM with revenue or the '1% of a huge market' fallacy.
- Industry Structure & Value ChainsApply Porter's Five Forces and value chain to judge an industry's profitability and locate its profit pools.Michael Porter argued in 'How Competitive Forces Shape Strategy' (HBR, 1979) that long-run industry profitability is governed by structure, captured in five forces: competitive rivalry at the center, the threat of new entrants, the threat of substitutes, and the bargaining power of buyers and of suppliers; each is rated low/medium/high with a structural reason, and weak forces signal an attractive market. His value chain, introduced in 'Competitive Advantage' (1985), splits a firm's activities into primary (inbound logistics, operations, outbound logistics, marketing & sales, service) and support (firm infrastructure, HR, technology development, procurement). Across the industry chain, the profit pool — total profit across all links — concentrates unevenly and migrates over time, so strategists position where deep or forming pools sit, not merely where revenue flows.
- Mapping the LandscapeBuild an honest market/positioning map by choosing meaningful axes and defining the category correctly.A market or landscape map visualizes the players in a space to reveal structure, clusters, white space, and adjacencies. Positioning maps depend on choosing two buyer-relevant, independent axes that scatter competitors and expose trade-offs, rather than self-flattering ones. Defining the category boundary is itself strategic — anchored on the customer's job-to-be-done — because it determines who counts as a competitor and where gaps appear. White space is a hypothesis to validate, not a guaranteed prize, and a lazy or cherry-picked map is actively misleading.
- Trends & Environmental ScanningScan the macro-environment with PESTEL and filter trends into product-relevant opportunities and threats.Environmental scanning asks what forces beyond the immediate competitive arena will reshape a market. The PESTEL framework prompts across six lenses — Political, Economic, Social, Technological, Environmental, and Legal — and traces to Francis Aguilar's 1967 'Scanning the Business Environment' (the ETPS grouping), later expanded to PEST and PESTEL. The discipline is distinguishing durable trends (with real, compounding drivers) from fads, then filtering by impact and uncertainty and converting each chosen force into a concrete 'so what' for the product so the scan actually changes a decision.
- Adoption DynamicsExplain how innovations diffuse through adopter segments and why high-tech products must cross the chasm.Everett Rogers' 'Diffusion of Innovations' (1962) showed adoption follows a bell-shaped curve across five segments — Innovators (~2.5%), Early Adopters (~13.5%), Early Majority (~34%), Late Majority (~34%), and Laggards (~16%) — each with distinct psychology, and identified attributes (relative advantage, compatibility, complexity, trialability, observability) that affect adoption speed. Geoffrey Moore's 'Crossing the Chasm' (1991) added that high-tech adoption stalls in a gap between visionary early adopters and pragmatic early majority, prescribing a focused beachhead and a whole product to earn the references pragmatists trust. Adoption stage is a lens overlaid on sizing and mapping.
- From Map to OpportunityConvert market analysis into a scored, prioritized opportunity assessment with explicit assumptions and a recommendation.An opportunity assessment turns the map, sizing, forces, profit pools, trends, and adoption read into a short list of 'where to play' options, evaluated on a consistent rubric (size and growth, unmet need, competitive intensity, profit-pool attractiveness, right-to-win, timing) and prioritized. Some criteria act as gates rather than points, weighted totals are conversation-starters not verdicts, and rankings should be sensitivity-tested to guard against tuning weights to a foregone conclusion. The assessment surfaces its assumptions, flags the high-impact unproven ones, and pairs each top opportunity with a cheap experiment, ending in a defensible recommendation.
- Guided Project: Market Map + Opportunity Assessment (Peer-style critique)Produce a market map plus a prioritized, sourced opportunity assessment and refine it through peer-style critique.This guided project walks the learner through building the artifact end to end: define the category by job-to-be-done and set an explicit boundary; build an honest positioning or category map; size opportunities with bottom-up SOM cross-checked top-down; run Porter's Five Forces and sketch the value chain to locate the profit pool; run a filtered PESTEL scan and tag opportunities by adopter segment and chasm stage; score and rank candidates against a defined rubric using gates and sensitivity tests; and write a recommendation naming the riskiest assumption, the next cheap test, and what is explicitly declined. A peer-style critique then attacks the weakest links before a final revision.
Questions this course answers
A founder claims, 'The global logistics market is $9 trillion, and we only need 0.1% to build a huge business.' What is the core flaw in this reasoning?
This is the classic '1% of a huge market' fallacy: it states a share with no plausible path to winning it, and conflates TAM (the theoretical ceiling) with SOM (what you can realistically obtain). Bottom-up isn't literally mandatory (top-down has uses as a cross-check), the share size isn't inherently the problem, and the headline figure's accuracy isn't the central issue.
Which calculation is a bottom-up market size estimate?
Bottom-up builds from defensible operating units — reachable customers × adoption × price/frequency — so every input is testable. Option A is the definition of top-down (slicing a big total by percentages). The other two are derived from published totals rather than built up from unit economics.
Your bottom-up SOM estimate is $40M, but a top-down approach yields $4B. What is the most appropriate response?
A two-order-of-magnitude gap means an assumption is wrong somewhere; triangulation's value is that disagreement pinpoints where to dig, not that you blend or pick the flattering number. Averaging hides the error, choosing the larger one is dishonest, and published top-down figures are not automatically more credible than a grounded bottom-up build.
Porter's Five Forces framework was first introduced in which 1979 publication, and what does it primarily assess?
Porter introduced the Five Forces in 'How Competitive Forces Shape Strategy' (HBR, 1979), and the framework diagnoses the structural forces governing an industry's long-run profitability, not a single firm's share or brand. 'Competitive Strategy' (1980) and 'Competitive Advantage' (1985, which introduced the value chain) are later works.
In an industry, two equally large buyers account for 80% of all purchases, and the product is undifferentiated. What does Porter's framework predict?
Few, large buyers purchasing an undifferentiated product have strong bargaining power and can drive prices and margins down. This is about buyers (customers), not suppliers; concentrated demand among a couple of buyers typically intensifies rivalry among sellers and does not by itself attract entrants.
Within an industry, one link captures most of the total profit while a different, higher-revenue link earns thin margins. What concept does this illustrate?
A profit pool is the total profit across the chain, and it is often concentrated in links that aren't the highest-revenue ones — revenue share and profit share are different maps. The other options contradict this: high revenue doesn't guarantee high margin, profit is rarely even, and margin depends on industry structure, not just internal operations.
Grounded in trusted sources
- Wikipedia, 'Total addressable market' (definitions of TAM/SAM/SOM and top-down vs. bottom-up sizing)
- HubSpot Marketing Blog, 'TAM, SAM & SOM: What Do They Mean & How Do You Calculate Them?'
- Michael E. Porter, 'How Competitive Forces Shape Strategy', Harvard Business Review (1979)
- Michael E. Porter, 'Competitive Advantage: Creating and Sustaining Superior Performance' (1985)
- Harvard Business School, Institute for Strategy and Competitiveness — 'The Five Forces' (isc.hbs.edu)
- Clayton M. Christensen et al., Harvard Business Review, 'Know Your Customers' Jobs to Be Done' (2016) — job-to-be-done framing for category definition
Every Wunder lesson is built from real, reputable sources — never invented.
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