How to Apply Porter's Five Forces to a Startup
Applying Porter's Five Forces to a startup means a structured read on the market you want to enter: first define the industry boundary, then rate competitive rivalry, the threat of new entrants, the threat of substitutes, supplier power, and buyer power as High, Medium, or Low. The combined pattern tells you how attractive the market really is.
Quick Answer: Michael Porter's Five Forces (Harvard Business Review, 1979) is a framework for judging an industry's attractiveness. To apply it as a founder, name your market, score each of the five forces High/Medium/Low using observable signals, then read the overall pattern. Treat the result as a static snapshot of today's structure, not a forecast.
Most founders jump straight to "who are my competitors?" and stop there. Porter's Five Forces asks a bigger question: is this market worth competing in at all? Rivalry is only one of the five pressures on your future margins.
Michael Porter introduced the framework in a 1979 Harvard Business Review article and expanded it in his 1980 book Competitive Strategy. His core argument is that profitability is shaped less by any single rival and more by five structural forces that together decide how much value the average player in an industry can keep.
That "average player" framing matters: the forces describe the industry you are entering, not you. A strong team can outperform an ugly structure, but the structure sets the baseline everyone fights against. For the theory and origins, our guide to Porter's Five Forces for startups covers the model itself; this piece is the hands-on procedure.
Prerequisites — Define the Market Boundary Before You Score Anything
Before you rate a single force, draw the boundary of the industry you are analyzing. Five Forces measures the structure of a market, not the strengths of one company, so a fuzzy boundary produces a useless read.
Porter built the tool to analyze an industry — a set of firms making close-substitute products for the same buyers. You need two boundaries:
- Product scope — the set of offerings a customer would treat as interchangeable for the same job.
- Geographic scope — the region where those firms actually compete for that buyer.
Get the boundary wrong in either direction and the analysis breaks. Draw it too broad ("software," "wellness") and every force reads Medium, telling you nothing. Draw it too narrow ("our exact feature") and you blind yourself to the substitutes and entrants that will hit you anyway.
Before scoring, write down four things: the job customers hire the product to do, the firms selling close substitutes today, the buyer segment you mean to serve, and the region you will operate in. That one paragraph anchors every rating that follows.
One honest caveat up front. Porter designed Five Forces for established industries with recognizable boundaries. If you are creating a genuinely new category, the "industry" barely exists yet and several forces will be hard to score — a known limitation of the framework, not a failure of your analysis.
Assess Each of the Five Forces — A Step-by-Step Read
Work through the five forces one at a time, gathering observable signals for each rather than gut feelings. The goal at this stage is not a score yet — it is a short evidence list per force that you can defend.
Step 1 — Rate Competitive Rivalry Among Existing Players
Competitive rivalry gauges how hard the firms already in your market will fight for the same customers — the most visible force, and in most startup markets the one that bites first.
Look at the number and balance of competitors (many similar-sized rivals means fiercer fighting), the industry growth rate (slow growth turns competition into a zero-sum war for share), differentiation and switching costs (undifferentiated products compete on price), and exit barriers (players who cannot leave keep fighting even while losing money). Our deeper competitive rivalry analysis walks through each signal with examples.
Step 2 — Gauge the Threat of New Entrants
The threat of new entrants measures how easily a new competitor could copy your position once you prove the market exists. High threat means any success you have invites a crowd.
Assess the barriers to entry: economies of scale, capital requirements, brand loyalty, proprietary technology or data, access to distribution channels, customer switching costs, and regulation. The key startup question is reflexive — the same low barriers that let you enter will let the next founder enter right behind you. Also weigh likely incumbent retaliation: a rival with cash and a reason to defend will make entry painful regardless of the technical barrier.
Step 3 — Map the Threat of Substitutes
The threat of substitutes captures products from outside your industry that solve the same customer job a different way. This is the force founders most often miss, because substitutes do not show up in a competitor list.
Ask what customers use today to get the job done — including spreadsheets, manual processes, an in-house tool, or simply doing nothing. Then weigh the price-performance trade-off (a cheaper "good enough" alternative caps what you can charge), the switching cost to that alternative, and the buyer's propensity to substitute. A strong substitute puts a ceiling on the whole industry's pricing, not just yours.
Step 4 — Weigh the Bargaining Power of Suppliers
Supplier power measures how much the providers of your key inputs can squeeze your margins. For a modern startup, "suppliers" means cloud infrastructure, third-party APIs and data, payment rails, hardware components, and specialized talent.
Supplier power runs high when there are few suppliers, the input is unique or critical, switching costs are high, or a supplier could plausibly move downstream and become your competitor. It runs low when inputs are commoditized and interchangeable. Map each critical input and ask: if this supplier doubled its price or changed its terms tomorrow, what would happen to us?
Step 5 — Weigh the Bargaining Power of Buyers
Buyer power measures how much your customers can push back on price and terms. It is often high for startups precisely because early customers know they are doing you a favor.
Buyer power runs high when buyers are concentrated (a few large accounts), purchase in volume, face low switching costs, see the product as undifferentiated, are price-sensitive, or could build the thing themselves (backward integration). It runs low when buyers are fragmented, the product is differentiated and sticky, and switching is painful. Full price transparency in the market also tilts power toward buyers.
Score Each Force High, Medium, or Low — A Signal Rubric
Turn your evidence lists into a rating for each force using observable signals, not fabricated numbers. High means the force pushes profits down for players in the industry; Low means the force is favorable. The table below is the rubric — read down your five evidence lists and place each force.
| Force | Reads HIGH (pressure on profits) when… | Reads LOW (favorable) when… | Where to look |
|---|---|---|---|
| Competitive rivalry | Many similar-sized rivals, slow growth, weak differentiation, high exit barriers | One clear leader or few players, growing demand, strong differentiation, easy exit | Competitor count and balance, growth rate, switching costs |
| Threat of new entrants | Low capital and scale needs, weak brands, open distribution, no regulation | Heavy capital or scale requirements, strong brands, locked-up distribution, licensing | Barriers to entry, likely incumbent retaliation |
| Threat of substitutes | Cheaper or "good enough" alternatives from other categories, low switching cost | No close alternative for the job, high switching cost, wide performance gap | Adjacent categories, the current workaround, price-performance |
| Bargaining power of suppliers | Few suppliers, unique or critical inputs, high switching cost, forward-integration risk | Many interchangeable suppliers, commodity inputs, low switching cost | Key input concentration, input uniqueness |
| Bargaining power of buyers | Concentrated buyers, large volumes, undifferentiated product, price-sensitive customers | Fragmented buyers, differentiated sticky product, high switching cost | Customer concentration, price sensitivity, switching cost |
Takeaway: You are rating the structure, not your product. "Our app is better" is not a Low rivalry score — it is your bet on how to survive High rivalry. Keep the two separate or the whole exercise becomes wishful thinking.
Read the Combined Picture — What the Pattern Means
Read the five ratings as a pattern, not an average — a single High force can cap the returns of an otherwise attractive market, so the goal is to see which forces threaten profitability and which you can turn to your advantage.
Do not average the scores into one number. Four favorable forces do not rescue a market where buyers hold all the power. Instead, scan for the binding constraint: the one or two High forces that will most shape your strategy and pricing.
Here is a hypothetical read for a vertical SaaS startup entering an established category. The ratings are illustrative — the shape of a conclusion, not real data.
| Force | Hypothetical rating | Illustrative reasoning |
|---|---|---|
| Competitive rivalry | High | Several funded incumbents chase the same buyers |
| Threat of new entrants | Medium | Low technical barriers, but trust and distribution take time |
| Threat of substitutes | Medium | Spreadsheets and generic tools do a rough version of the job |
| Bargaining power of suppliers | Low | Cloud and payment rails are commoditized and interchangeable |
| Bargaining power of buyers | High | Small customers are price-sensitive and churn easily |
In this pattern, the binding constraints are rivalry and buyer power. The founder's job is then to design a wedge against those specific forces — a sharp niche with switching costs that blunt buyer power, rather than a broad feature race that only feeds rivalry. This is the structural read Edmired encourages before you commit a roadmap to a market.
The static-snapshot caveat applies here most. Your ratings describe the industry as it is today. New technology, regulation, or a well-funded entrant can redraw the whole board, so date your analysis and revisit it — Five Forces is a photo, not a film.
Mistakes to Avoid When Applying Five Forces to a Startup
Most bad Five Forces analyses fail in a handful of predictable ways. Watch for these before you trust your conclusion.
- Treating it as a competitor list. Five Forces judges industry structure; a named-rival teardown is a different, complementary job covered in our complete competitor analysis playbook. Do both, but don't confuse them.
- Analyzing at the wrong boundary. Too broad and everything is Medium; too narrow and you miss substitutes. Fix the boundary first.
- Averaging the forces. A market is defined by its worst constraint, not its mean. Look for the binding force.
- Scoring your company instead of the industry. "We're better" belongs in your strategy, not your rivalry rating.
- Treating the snapshot as a forecast. The framework is static by design; a fast-moving market can invalidate it in a quarter.
- Ignoring what the model leaves out. Porter's original five forces omit complementors, network effects, and government as a standalone force — account for them separately when they matter.
Key Takeaways
- Five Forces judges the market, not you. It estimates how attractive an industry is for the average player, attributed to Michael Porter (HBR 1979; Competitive Strategy, 1980).
- Define the boundary first. Product scope and geographic scope set the frame; get them wrong and every rating is noise.
- Score each force High/Medium/Low from signals, not invented numbers — rivalry, new entrants, substitutes, supplier power, and buyer power.
- Read the pattern, don't average it. Find the one or two binding forces that will shape your pricing and strategy.
- Design your wedge against the High forces, and keep "our product is better" separate from the structural rating.
- It is a static snapshot of an established industry — date it, revisit it, and expect a new category to score poorly on parts of the model.
- Pair it with a competitor teardown, since structure analysis and rival analysis answer different questions.
Frequently Asked Questions
How do you apply Porter's Five Forces to a startup step by step?
Define your market boundary (product and geography), then work through the five forces in order: competitive rivalry, threat of new entrants, threat of substitutes, bargaining power of suppliers, and bargaining power of buyers. Gather observable signals for each, rate it High, Medium, or Low, then read the combined pattern to spot the forces that most threaten your margins.
What's the difference between Porter's Five Forces and a competitor analysis?
Five Forces analyzes the structure of an entire industry to judge how attractive it is to enter. A competitor analysis studies specific named rivals — their features, pricing, and positioning. Five Forces tells you whether the pool is worth swimming in; a competitor teardown tells you who else is in the water. Founders should run both, since they answer different questions.
Is Porter's Five Forces still relevant for startups and fast-moving markets?
Yes, as a structural checklist — but with limits. Porter designed it for established industries, and it produces a static snapshot, so it can miss network effects, complementors, and rapid disruption. Use it to understand today's forces and find your wedge, then revisit it whenever technology, funding, or regulation reshapes the market. Treat it as one input, not a verdict.