In a typical first-round set of eight cases, two or three candidates will call a market "attractive" after citing size and growth, then wait for the interviewer to hand them the next exhibit. I stop listening when the sentence has no subject. Attractive to whom, and at what cost of getting in? That is the whole game.
Market attractiveness is not a property of a product category. It is a score of expected returns for a defined client against a defined barrier set. The GE–McKinsey nine-box made that explicit for corporate capital allocation; Porter's structural analysis explained why some large industries still earn thin profits. After this piece you will be able to build a weighted scorecard, catch the "big market" trap mid-case, and recommend which market deserves deeper work without drifting into entry-mode design.
Where the idea actually comes from
Two lineages sit behind every decent attractiveness answer. Know them so you do not invent folklore.
In the early 1970s, McKinsey and General Electric built a multifactor portfolio screen for GE's sprawling set of business units. McKinsey's own retrospective still frames the tool the same way: judge a unit by industry attractiveness and by competitive strength inside that industry, then use the nine-box grid to decide where cash should go (Enduring Ideas: The GE–McKinsey nine-box matrix). Attractiveness is one axis, not the full decision. A weak unit in a hot industry is a different problem from a strong unit in a dull one.
The second lineage is structural. Harvard's Institute for Strategy and Competitiveness still teaches that industry profitability is shaped by five competitive forces: rivalry, threat of entry, buyer power, supplier power, and substitutes (The Five Forces). Porter first published the argument in his 1979 HBR article and expanded it in Competitive Strategy (1980). Size and growth do not appear as the definition of attractiveness. Structure does. That is why airlines can post nearly a trillion dollars of revenue and still look like a poor bet for a new entrant.
Philippe Haspeslagh's 1982 HBR survey of portfolio planning in large U.S. firms is the useful caution: the grids matter as a management conversation, not as a mechanical capital formula (Portfolio Planning: Uses and Limits). In interview, that translates cleanly. Use the scorecard to force trade-offs. Do not treat a 3.8 as destiny.
What you score when the prompt says "is this market attractive?"
Keep the market definition tight first: product, buyer, geography, channel, and time horizon. "Snacks in Europe" is not a market. "Premium refrigerated pet wet food sold through grocery in the U.S. Midwest, next five years" is.
Then score five criteria that map to the two lineages above. I use these labels in the room because candidates can say them aloud without sounding like a textbook:
| Criterion | What you are really asking | Typical weight (growth client) |
|---|---|---|
| Demand trajectory | Is the need growing, and for which buyers? | 20% |
| Profit-pool depth | After realistic pricing and cost-to-serve, is there money left? | 25% |
| Structural intensity | Do Porter's forces compress returns even if demand is fine? | 25% |
| Access cost | What must the client spend or build before the first dollar of profit? | 20% |
| Risk and timing | What breaks the thesis before payback? | 10% |
Weights sum to 100%. Change them when the client's objective changes. A PE sponsor hunting cash yield will overweight profit-pool depth and access cost. A corporate strategy team chasing adjacency growth may overweight demand. Say the weights out loud. Silent weights are how candidates smuggle preference into a fake number.
Score each market 1 to 5 with an anchor. A 4 on structural intensity means "forces look milder than the peer set we just named," not "I like this industry." Multiply, sum, compare. Then stress-test: swap the two heaviest weights. If the ranking flips, the decision is a judgment call. Say that. The interviewer is listening for intellectual honesty, not for a polished 4.2.
This scorecard stops at "is the market worth deeper pursuit for this client?" How to enter, partner, or build is a different article: see the market entry framework.
Where "attractive market" reasoning fails in a live case
Prompt I use in coaching: HarborLine Foods, a Midwestern private-label sauce maker with strong grocery relationships, is asked whether commercial airline catering sauces are an attractive adjacent market. The candidate hears "airlines," recalls huge passenger volumes, and starts sizing meals.
That answer fails on two questions the scorecard forces.
Attractive to whom? HarborLine's asset is retailer shelf access and low-cost batch production. Airline catering runs through a handful of large caterers with multi-year contracts, tight food-safety specs, and brutal switching costs. The market may be fine for an incumbent caterer. It is not fine for HarborLine. Relative position is half of the GE–McKinsey screen for a reason.
At what entry cost? Even if demand is enormous, the cost of becoming an approved supplier, winning a bid cycle, and holding inventory against irregular flight schedules can erase the margin. IATA's June 2025 outlook still puts industry net margin at about 3.7% on roughly $979 billion of revenue, roughly half the all-industry average (Airline Profitability to Strengthen Slightly in 2025). That is structural intensity talking: capital intensity, buyer power, and rivalry leave thin residual profit. Calling the market attractive because passengers eat food is the large-market fallacy with better vocabulary.
In the room, the fix is a one-sentence pivot: "Large demand, compressed industry economics, and high access cost for a retailer-oriented producer. I would screen this as unattractive for HarborLine unless we find a niche with different buyers." Then ask for the data that would change the call: caterer concentration, typical supplier margins, approval lead times, and required working capital.
Worked example: two cities, one scorecard
Client: Northbridge Pet Co., a regional premium dry-food brand with loyal specialty-store distribution and a thin grocery presence. Decision: which metro foodservice-adjacent wet-food opportunity deserves a full entry study next year, Riverbend (metro pop. 2.1 million) or Clearwater (metro pop. 3.4 million)? Figures below are illustrative case numbers; treat them as exhibit data.
| Criterion (weight) | Riverbend evidence | Score | Clearwater evidence | Score |
|---|---|---|---|---|
| Demand trajectory (20%) | Premium wet food +9% CAGR; 18% of pet households already premium | 4 | Premium wet +6% CAGR; category still 11% premium | 3 |
| Profit-pool depth (25%) | Specialty ASP $4.80/unit; contribution after slotting ~32% | 4 | Grocery ASP $3.10/unit; contribution after slotting ~14% | 2 |
| Structural intensity (25%) | Two regional brands; specialty buyers fragmented | 4 | National A and B hold 55% grocery share; private label rising | 2 |
| Access cost (20%) | Needs 40 specialty doors; broker fee 8%; no new plant | 4 | Needs national-account grocery team; estimated $4.5M year-1 trade spend | 2 |
| Risk and timing (10%) | Rent and labor stable; 18-month payback at base case | 3 | Retailer resets every 12 months; payback 4+ years | 2 |
Weighted scores:
Riverbend = 4(0.20) + 4(0.25) + 4(0.25) + 4(0.20) + 3(0.10) = 0.8 + 1.0 + 1.0 + 0.8 + 0.3 = 3.9
Clearwater = 3(0.20) + 2(0.25) + 2(0.25) + 2(0.20) + 2(0.10) = 0.6 + 0.5 + 0.5 + 0.4 + 0.2 = 2.2
Clearwater is the larger metro. Riverbend is the more attractive market for Northbridge. The gap is not demand theater; it is profit pool, structure, and access cost lined up against this client's channel strengths. Stress test: raise access cost to 30% and cut profit-pool weight to 15%. Riverbend still leads (about 3.9 vs 2.2). The ranking is robust.
Recommendation language that earns the point: "Riverbend scores 3.9 versus 2.2 on a growth-oriented scorecard. I would take Riverbend into entry planning and park Clearwater unless grocery capability and trade-spend appetite change." That handoff is intentional. Attractiveness decided which market; entry design decides how.
Ned's rule. Never say "attractive" without naming the client and the first year of cost. If you cannot finish the sentence "attractive for X at roughly $Y to get in," you are describing a newspaper headline, not a market.
What the interviewer is actually scoring
Structure without a decision sentence is theater. Open with the client's objective, then the five criteria with weights, then the first branch that could kill the thesis. If access cost looks lethal, lead there. Walking demand-growth-competition in alphabetical order is how average candidates sound organized while wasting the clock.
Numbers without anchors are also theater. A score of 4 needs a peer comparison or an exhibit line. When no numbers exist yet, ask for the ones that move the weighted total, not for "more market data."
Finally, keep competitive intensity in one place. Candidates double-count rivals under size, pricing, barriers, and risk until every branch says the same thing. Put structure in its row, then show how it hits the profit pool. Porter's forces are a lens for that row, not a second full framework bolted on top. For growth sequencing after the screen, the Ansoff matrix is the cleaner follow-on tool.
Practice the relative score today
Take any growth prompt and force a two-market comparison in ten minutes. Define the market tightly, write five criteria with weights, invent or request two columns of evidence, and compute weighted scores. Then flip the two heaviest weights and say whether the ranking holds. If you cannot finish the math aloud, drill market sizing and structure until the arithmetic is automatic.
When you want the full pressure test, run a live case on CoachNed: everything is open for seven days, no card; then $120 for a recruiting season or $49 a month. Start with the five-minute typed rep at /start, or take the ~18-minute voice case at /interview.
CoachNed is not affiliated with McKinsey, BCG, Bain, Deloitte, or any firm named above.
Frequently asked questions
What is the market attractiveness framework in a case interview?
It is a weighted screen of whether a defined market is worth deeper pursuit for a defined client, usually across demand, profit-pool, structural intensity, access cost, and risk. It answers "pursue or park," not "build, buy, or partner."
How is market attractiveness different from market entry?
Attractiveness decides whether the market deserves scarce attention. Entry decides mode, timing, and capabilities once you have chosen to go deeper. Mixing them early produces a muddy issue tree and a soft recommendation.
Is the GE–McKinsey matrix the same as market attractiveness?
No. The nine-box plots industry attractiveness against competitive strength to allocate capital across units. Attractiveness is one axis. In interview, use the attractiveness score alone when the prompt is a screen; bring in relative strength when the prompt asks where to invest among options the client already owns or could own.
Can a small market be more attractive than a large one?
Yes. A smaller market with deep profit pools, milder structural intensity, and low access cost for your client often beats a giant market with thin margins and locked channels. Size is an input to demand, not a synonym for attractiveness.
How many criteria should I use in the scorecard?
Five to seven. More than that adds noise; fewer than four usually hides the trade-off that matters. Weights should sum to 100%, and you should be able to defend each weight in one sentence.
Sources
- Enduring Ideas: The GE–McKinsey nine-box matrix — McKinsey's description of industry attractiveness vs. competitive strength and the nine-box investment logic. Checked 2026-09-24.
- The Five Forces — Harvard ISC primary page on Porter's structural drivers of industry profitability. Checked 2026-09-24.
- Portfolio Planning: Uses and Limits — Haspeslagh (HBR, Jan–Feb 1982) on portfolio grids as management process rather than mechanical formula. Checked 2026-09-24.
- Airline Profitability to Strengthen Slightly in 2025 — IATA June 2025 outlook: ~$979B revenue, ~3.7% net margin as a structural-intensity illustration. Checked 2026-09-24.
- Porter, Michael E. Competitive Strategy. Free Press, 1980 — foundational book treatment of industry structure and attractiveness. Checked 2026-09-24.