I have sat in a lot of investor meetings over the years, and there is a pattern I have noticed in the ones that go badly. The founder presents their market opportunity, product, team, and financial projections with evident confidence. Then an investor asks a simple question: “Who else could enter this market, and why wouldn’t they?” The founder hesitates. They have thought deeply about their own capabilities and not nearly enough about the structural forces that will shape whether this business is ever as profitable as the projections suggest.
Porter’s Five Forces is the framework that should have answered that question long before the investor asked it. Developed by Harvard Business School professor Michael Porter in 1979, it remains one of the most practically useful tools in strategic analysis — not because it is complex, but because it forces founders and business leaders to think about profitability as a function of market structure rather than just product quality and execution effort [1].
The uncomfortable truth that Porter’s framework surfaces is this: some industries are structurally more profitable than others, regardless of how well individual businesses within them are run. A highly capable business in a structurally poor industry will consistently underperform a moderately capable business in a structurally attractive one. Understanding the forces that determine structural attractiveness is not optional strategic analysis—it is the foundation for knowing whether your business can ever achieve the margins your financial projections assume.
This guide covers each of the five forces in depth, with UK-specific examples, explains how to rate their intensity for your own market, and shows you how to translate the analysis into decisions that actually change what you do.
What Porter’s Five Forces Is — and What It Is Not
Before the framework itself, a clarification that matters for how you use it.
Porter’s Five Forces is an analysis of industry structure — the competitive dynamics of the market you are operating in, not just the specific competitors you face today. This distinction is important. A traditional competitive analysis asks: “Who are my competitors and what are they doing?” Porter’s framework asks: “What are the structural forces that determine how much profit any business in this industry can sustainably make, and where is the leverage for changing that?”
The five forces are: competitive rivalry among existing competitors; the threat of new entrants; the threat of substitute products or services; the bargaining power of buyers; and the bargaining power of suppliers. Together, these forces determine the average profitability of an industry. When all five forces are intense, average profitability is low. When several forces are weak, the industry creates and retains more value for participants.
What it is not: a marketing framework, a one-time exercise, or a substitute for operational strategy. The Five Forces analysis tells you what game you are playing and how difficult the rules make it — it does not tell you how to play the game well. That is what operational strategy, positioning, and execution are for. Porter’s framework and SGI’s Business Success Formula address complementary questions: the Five Forces explains the external structural environment; the Business Success Formula — Appeal, Profitability, Sustainability — explains the internal and commercial conditions a business must satisfy to succeed within that environment.
Force 1: Competitive Rivalry Among Existing Competitors
This is the force most founders think about first and most instinctively — who else is selling what I am selling, and how aggressively are they competing? But the Five Forces framework treats rivalry as something more structural than a roster of named competitors.
The intensity of competitive rivalry in an industry is determined by several structural factors: the number of competitors and their relative balance of size and capability; the rate of industry growth (slow-growing markets force competitors to fight for share rather than growing with the market); the degree of product differentiation (the less differentiated the products, the more competition defaults to price); the proportion of fixed to variable costs (high fixed cost businesses are under more pressure to maintain volume, which drives price competition); and the height of exit barriers (when it is costly or difficult to leave an industry, unprofitable competitors stay and continue to suppress margins for everyone).
UK Example: High Rivalry — UK Haulage and Road Freight
The UK haulage sector clearly illustrates structural high rivalry. There are over 80,000 registered haulage operators in the UK, ranging from single-vehicle owner-operators to large fleet operators [2]. The service is broadly undifferentiated — a pallet moved from Manchester to Bristol is the same whether a large or small operator delivers it. Fuel costs account for a large share of total operating costs, and those costs are shared across the industry, making it hard to sustain a cost advantage. Driver shortages have added labour cost pressure equally across all participants. Exit barriers are relatively low for small operators, but the overcapacity inherited from periods of easier credit has kept margins thin across the sector.
The result is an industry with a structurally compressed average operating margin. Individual operators can outperform through specialisation — temperature-controlled freight, hazardous materials, last-mile delivery for specific verticals — but the baseline structural rivalry makes it very difficult to generate strong margins in undifferentiated general haulage.
UK Example: Lower Rivalry — UK Private Wealth Management
Contrast haulage with UK private wealth management for high-net-worth clients. The industry has a moderate number of participants, but service differentiation is high—relationships, track record, specialist expertise, and trust accumulate over years and are genuinely difficult to replicate. Client switching costs are high: changing wealth managers means reassessing a complex portfolio, transferring accounts, and rebuilding a relationship. Industry growth tracks UK private wealth, which has been relatively consistent over the long term. Exit barriers are low, which keeps the competitive field cleaner than in capital-intensive industries. The result is a sector in which well-positioned participants can sustain strong margins because, while rivalry is present, it is structurally dampened.
What to Do With This Force
When assessing rivalry in your own market, the questions to ask are: how many close competitors exist, and are their capabilities broadly similar to yours? Is the market growing fast enough that competitors can grow without fighting each other for share? Can you differentiate your product or service meaningfully, or does competition default to price? Are exit barriers low enough that weak competitors will eventually leave, or will they stay and continue to undercut?
For businesses with strong competitive rivalry, the strategic responses are: find and own a sub-segment where you can achieve genuine differentiation; build switching costs into your customer relationships; and focus investment on the capabilities that are hardest to replicate rather than on commoditised elements of the service.
Force 2: The Threat of New Entrants
The threat of new entrants is a structural characteristic of the industry, not a prediction about whether a specific competitor is about to launch. Industries with low barriers to entry are perpetually threatened by new competition that will suppress margins whenever the industry becomes attractive enough to invite it. Industries with high barriers protect their participants’ margins through structural insulation rather than competitive performance alone.
The barriers to entry that matter are: capital requirements (how much money does it cost to enter at competitive scale?); economies of scale (do incumbents have cost advantages from volume that new entrants cannot replicate?); brand and customer loyalty (how much does an established reputation matter, and how long does it take to build?); access to distribution channels (can a new entrant access the same routes to market as incumbents, or are those channels controlled or exclusive?); regulatory and compliance barriers (what licences, accreditations, or regulatory requirements must be met?); and switching costs (are customers sufficiently locked in to incumbents that winning them requires overcoming significant inertia?).
UK Example: High Entry Barriers — UK Commercial Banking
UK commercial banking for SME and corporate clients has entry barriers so high that the market structure has remained fundamentally stable for decades. Capital requirements under Basel III/IV are enormous — a bank must hold significant tier-one capital against its lending book, which requires either substantial equity or a complex capital structure [3]. FCA and PRA authorisation processes are lengthy and demanding. Branch infrastructure and payment systems require years to build or billions to acquire. The brand trust required to attract depositors and lending customers takes decades of operating history to establish. Challenger banks have entered segments of the market — current accounts, payment processing, certain forms of consumer credit — but the structural barriers to competing in full-service commercial banking have kept the market highly concentrated.
UK Example: Low Entry Barriers — UK Management Consulting (SME Segment)
The SME-focused business consulting sector in which SGI operates is worth being honest about: entry barriers are genuinely low. Starting a consultancy requires modest capital, no regulatory authorisation, and no technical infrastructure. The route to market is largely digital, and new entrants can establish credibility through content and case studies without the long lead times required in more capital-intensive industries. This is why the UK consulting market is crowded with sole traders and small firms operating alongside established consultancies.
The strategic response to low entry barriers is not to pretend they are higher than they are — it is to build the specific barriers that make your position defensible over time: a track record of measurable client outcomes, proprietary methodologies, client relationships with high switching costs, and a reputation that takes years to replicate. The 2,000+ businesses supported, and 90% funding success rate that SGI has built are not easily replicated by a new entrant — they are the accumulated result of 25 years of operational experience.
What to Do With This Force
For businesses in markets with low entry barriers, the priority is building whatever natural barriers exist within your reach: relationships and reputation that take time to accumulate; proprietary processes, tools, or data that new entrants cannot quickly replicate; deep specialisation in a niche where generalist entry is unlikely to threaten your position; and client contracts with meaningful terms that create switching inertia. For businesses in high-barrier markets, the threat of new entrants is less urgent, but the risk of being disrupted by a well-funded entrant that finds a way around traditional barriers — as fintech has done in elements of retail banking — warrants ongoing monitoring.
Force 3: The Threat of Substitute Products or Services
Substitutes are products or services from a different category that fulfil the same need your product addresses. They are distinct from direct competitors — a substitute does not necessarily look like your product or sit in the same industry classification. The threat of substitution sets a ceiling on industry pricing and profitability because buyers will switch to a substitute if the price differential becomes too large relative to the performance difference.
The intensity of the substitution threat depends on: the price-performance trade-off of the substitute (how much cheaper is it, and how much performance is lost by switching?); the switching cost between the product and the substitute; and the buyer’s propensity to substitute (how price-sensitive are they, and how willing are they to accept performance trade-offs for cost savings?).
UK Example: High Substitution Threat — UK High Street Retail
Physical retail in the UK has faced catastrophic substitution pressure from online retail over the past fifteen years. The substitute — buying the same products online — offers comparable or superior product selection, frequently lower prices, and the convenience of home delivery. The switching cost for the consumer is minimal. The result has been structural and persistent: UK high street vacancy rates have risen steadily, major retailers from Debenhams to Topshop to Wilko have entered administration, and those that have survived have done so largely by finding differentiated reasons to exist that online cannot replicate — sensory experience, immediacy, service expertise, or community [4].
The lesson for any physical retail business is that the Five Forces analysis would have identified this substitution threat clearly by 2005. The strategic question it should have prompted — what does the physical experience offer that online cannot substitute? — was answered well by some businesses and ignored by others with predictable consequences.
UK Example: Lower Substitution Threat — UK Independent Legal Services
Solicitors providing complex legal work — commercial contracts, property transactions with legal complexity, litigation, employment disputes — face a relatively low threat of substitution for their core services. DIY legal platforms exist for simple documents, and online legal services have captured some volume in commoditised areas such as standard will-writing and simple conveyancing. But for complex legal work, the regulatory requirements (legal advice must be given by authorised practitioners), the technical expertise required, and the risk of poor outcomes for the client if the work is done inadequately create strong limits on what substitutes can realistically offer. A business facing a complex commercial dispute cannot substitute an AI-generated template for qualified legal representation.
What to Do With This Force
For businesses facing strong substitution threats, the strategic response is to identify and reinforce what your product or service delivers that substitutes genuinely cannot. For physical retailers, that means the dimensions of experience, expertise, and immediacy that online cannot replicate. For service businesses, it means the quality of judgement, relationships, and outcomes that automated or self-service alternatives cannot match. The worst response to a substitution threat is to compete on price against the substitute — you are fighting on the ground where the substitute has a structural advantage. The correct response is to shift competition to the dimension where the substitute is weakest.
Force 4: The Bargaining Power of Buyers
Buyer power refers to the ability of customers to press for lower prices, better terms, or higher quality without equivalent improvement in what they pay. When buyer power is high, margins are structurally compressed because customers can extract value from suppliers. When buyer power is low, businesses retain more of the value they create.
Buyer power is high when: buyers are large relative to individual suppliers and purchase in significant volume; products are undifferentiated and switching between suppliers is easy; buyers have full price transparency and can compare offerings easily; buyers could credibly produce the product themselves (backward integration); and the purchase represents a large proportion of the buyer’s cost base, making them price-sensitive.
Buyer power is low when: buyers are numerous and fragmented, reducing the leverage of any individual buyer; the product is highly differentiated and not easily substituted; switching costs are high; and the purchase is a small proportion of the buyer’s total cost, reducing their motivation to push hard on price.
UK Example: High Buyer Power — UK Grocery Supply
UK grocery suppliers selling own-brand or undifferentiated products to the major supermarkets — Tesco, Sainsbury’s, Asda, Morrisons — operate in a context of extreme buyer power. The four major grocery chains collectively account for the vast majority of UK grocery retail volume, meaning a small number of buyers control the route to the consumer market. Products that are not meaningfully differentiated from competitors’ products can be sourced from multiple suppliers. The Groceries Supply Code of Practice exists specifically because supplier complaints about buyer behaviour — delayed payments, retroactive price adjustments, listing fee demands — became so severe that they required regulatory intervention [5].
The consequence for suppliers is predictable: grocery margins for undifferentiated products are typically very thin, and the balance of power in commercial negotiations sits firmly with the retailer. The businesses that have built defensible positions in this channel have done so through genuine brand strength that makes consumers ask for them by name — Heinz, Walkers, Cadbury — or through genuine product specialisation that reduces the number of viable alternative suppliers.
UK Example: Lower Buyer Power — UK B2B SaaS With Deep Integration
A B2B software business whose product is deeply integrated into the client’s operations — connected to their CRM, billing system, and customer data — has structurally low buyer power to contend with once the integration is in place. The switching cost of removing the software and replacing it is high in terms of both direct cost and operational disruption. Individual buyers are typically not large enough to represent a significant concentration of revenue. The purchase is often a relatively small line in the client’s overall operating cost. These structural factors give the software provider pricing power that a commodity supplier simply does not have.
What to Do With This Force
For businesses facing high buyer power, the strategic priorities are: differentiate the product or service so that the buyer cannot easily substitute another supplier; build switching costs through integration, relationship depth, or proprietary data; reduce concentration by growing the customer base so no individual buyer represents too large a proportion of revenue; and find ways to serve buyers’ customers directly (forward integration) which shifts the power dynamic by giving you independent access to end demand.
For businesses with low buyer power, the priority is protecting it—maintaining the differentiation, switching costs, and relationship depth that prevent buyer power from intensifying over time.
Force 5: The Bargaining Power of Suppliers
Supplier power is the mirror image of buyer power: the ability of the businesses you purchase from to charge higher prices, impose worse terms, or reduce quality without losing your business. When supplier power is high, input costs are structurally elevated and difficult to reduce. When supplier power is low, purchasing decisions are more efficient, and margins are easier to protect.
Supplier power is high when: there are few suppliers of a critical input and many buyers competing for their supply; the supplier’s input is highly differentiated and not easily substituted; switching suppliers is costly or disruptive; and the supplier could credibly move into the buyer’s market (forward integration). Supplier power is low when inputs are widely available from multiple sources, there is little differentiation between suppliers, and switching costs are low.
UK Example: High Supplier Power — UK Construction and Material Costs
UK construction businesses have faced significant supplier power challenges in recent years, particularly in structural steel, cement, and specialised building materials. The UK construction market sources significant quantities of materials from a concentrated set of producers and importers. Inflationary pressure in global commodity markets, combined with supply chain disruptions, gave suppliers extraordinary pricing power between 2021 and 2023, with materials costs rising significantly faster than output prices for many UK contractors [6]. For contractors with fixed-price contracts already in place, the inability to pass on these supplier cost increases to buyers led to severe margin compression.
The structural lesson is that businesses whose cost base is dominated by inputs from concentrated supplier markets face persistent margin risk that is not solved by operational efficiency alone — the profitability is structurally determined by how much of the value chain is concentrated upstream.
UK Example: Lower Supplier Power — Digital Service Businesses
A business whose primary inputs are cloud computing infrastructure, widely available software tools, and human talent has meaningfully lower supplier power to contend with — for the non-human inputs at least. Cloud computing has become a competitive market with multiple providers (AWS, Azure, Google Cloud) who compete on price and capability. The switching cost between cloud providers, while not trivial, is not prohibitive for a business with reasonably well-architected systems. Software tool markets are similarly competitive. The primary input with genuine supplier power in this context is exceptional specialist talent, where the concentration of truly exceptional engineers or creative professionals in specific disciplines creates genuine leverage in employment negotiations.
What to Do With This Force
For businesses with high supplier power, the responses are: develop alternative suppliers to reduce concentration and create competitive pressure; vertically integrate by acquiring or developing the capability to produce critical inputs internally where viable; use longer-term supply agreements to reduce price volatility; and design the product or business model to reduce dependence on the high-power inputs where possible. For businesses with low supplier power, maintain it by keeping alternative options alive, avoiding excessive lock-in to individual supplier platforms, and building procurement capability that can exploit the competitive supplier market effectively.
Running a Five Forces Analysis: A Practical Process
Understanding the five forces conceptually is useful. Running a structured analysis of your own market and translating it into strategic decisions is where value is created. Here is the process we work through with clients.
Step 1: Define the industry precisely. The quality of the analysis depends entirely on how the industry is defined in terms of specificity. “Retail” is too broad — the competitive dynamics of online fashion retail and independent specialist food retail are entirely different. “Premium women’s occasionwear sold through UK e-commerce channels to the 35-55 demographic” is a more useful industry definition for a business in that space. The more precisely the industry is defined, the more actionable the analysis becomes.
Step 2: Rate each force from low to high. For each of the five forces, identify the specific factors that are present in your industry and assess their combined effect on a three-point scale: low, moderate, or high. Document the reasoning for each rating — the rating itself is less important than the analysis that produces it.
Step 3: Identify the most powerful forces. In most industries, one or two forces dominate the profitability picture. Identify the forces that pose the most significant structural constraints on profitability in your market. These are the forces that deserve the most strategic attention.
Step 4: Map your current strategic position against those forces. For each of the dominant forces, assess your current exposure: how directly and severely does this force currently affect your margins and your competitive position? Where are you most vulnerable?
Step 5: Identify strategic responses. For each force with significant exposure, identify the specific strategic actions available to reduce that exposure. Not all forces can be significantly influenced — a small business cannot change the structure of the UK grocery supply market. But most businesses have more options than they realise to reduce their exposure to unfavourable structural forces through positioning, differentiation, and relationship strategy.
Step 6: Revisit annually. Industry structure is not static. Regulatory changes, technological disruption, consolidation among buyers or suppliers, and the arrival of well-funded new entrants can all significantly shift the balance of forces over a period of years. The Five Forces analysis should be a standing part of an annual strategic review, not a one-time exercise.
Porter’s Five Forces and Your Business Plan
For founders preparing business plans for investors or lenders, the Five Forces analysis serves a specific and important function: it demonstrates that you understand the structural dynamics of the market you are entering, not just the product opportunity. Investors and experienced lenders have read many business plans that describe a large market, a differentiated product, and a clear target customer without ever engaging with the question of why that market is, or can be, profitable. A well-executed Five Forces analysis, presented concisely in the market analysis section of a business plan, signals strategic maturity.
The analysis in the business plan should not be a mechanical walk through all five forces with equal weight given to each — it should identify the one or two forces most relevant to your market’s profitability, explain your current and intended position relative to them, and show how your strategy specifically addresses the structural challenges they present. Three paragraphs of genuinely insightful analysis is worth far more than five pages of boilerplate.
Frequently Asked Questions
What is the difference between Porter’s Five Forces and a SWOT analysis?
They operate at different levels of analysis and answer different questions. SWOT — Strengths, Weaknesses, Opportunities, Threats — is an assessment of a specific business’s internal capabilities (strengths and weaknesses) and the external environment it faces (opportunities and threats). It is partly internal and partly external. Porter’s Five Forces is entirely external — it analyses the structural dynamics of the industry, not the specific business. A complete strategic analysis typically uses both Five Forces to understand the industry structure, and SWOT to understand the specific business’s position within it. Used together, they identify both the structural characteristics of the competitive environment and the business’s positioning to navigate them.
Does Porter’s Five Forces work for small businesses, or is it only useful for large companies?
It is arguably more important for small businesses than for large ones. Large businesses with diversified revenue streams can absorb structural headwinds in one market segment through performance elsewhere. A small business concentrated in a single market with unfavourable structural forces has no such cushion — the structural analysis is directly determinative of whether the business can ever be sustainably profitable. The analysis does not require sophisticated resources to complete — it requires clear thinking about the dynamics of the specific market, which any business owner can do with the right framework.
How does Porter’s Five Forces relate to competitive advantage?
The Five Forces analysis identifies the structural conditions that make it difficult or easy to earn above-average returns in an industry. Competitive advantage is the business-specific capability that allows a particular company to outperform the industry average within those structural conditions. The two frameworks are complementary: Five Forces tells you how difficult the environment is; competitive advantage tells you why a specific business does better within that environment than its peers. A business with strong competitive advantage in a structurally poor industry will consistently underperform a business with moderate competitive advantage in a structurally attractive one — which is why industry selection, informed by Five Forces analysis, is as important a strategic decision as building competitive advantage.
Can Porter’s Five Forces analysis change a business’s strategic direction?
Yes, and it should when the analysis reveals that the market the business plans to enter is structurally unattractive in ways not previously understood. I have worked with founders who, having run a proper Five Forces analysis for the first time, identified that the market they were targeting had three or four structural forces working against them simultaneously — high rivalry, low barriers to entry, strong buyer power, and a credible substitute already gaining traction. That is not a market that rewards entry without a genuinely exceptional and defensible point of difference. In some cases, the analysis leads to a meaningful shift in positioning — not out of the market entirely, but towards a sub-segment where the structural forces are more favourable, and the business can build a defensible position before facing the full pressure of the broader competitive landscape.
How do I use Porter’s Five Forces alongside PESTLE analysis?
PESTLE analysis examines the macro-environmental factors affecting a business: Political, Economic, Social, Technological, Legal, and Environmental. Porter’s Five Forces examines the industry-level competitive structure. The relationship between them is that PESTLE factors frequently drive changes in the Five Forces over time. A technological shift (PESTLE: Technological) reduces barriers to entry (Five Forces: Threat of New Entrants). A regulatory change (PESTLE: Legal) alters supplier power by creating licensed monopolies or by opening previously restricted markets to competition. Running PESTLE and Five Forces together — PESTLE first to identify the macro trends, Five Forces next to understand their structural competitive consequences — produces a more complete picture of the strategic environment than either framework alone. In a business plan context, this combination forms the core of a rigorous market analysis section.
Does the framework account for digital and platform businesses?
Porter’s Five Forces was developed before the digital platform economy existed in its current form, and some aspects of the framework need to be adapted for platform businesses. The most important modification is that platform businesses are often two-sided markets — they serve both buyers and sellers simultaneously — which means buyer power and supplier power operate differently than in traditional linear industry structures. A platform that aggregates buyers also concentrates buyer-facing power, which can simultaneously reduce the traditional power of both individual buyers and suppliers. The threat of substitution for platforms is partly determined by network effects: a platform with strong network effects becomes increasingly difficult to substitute because its value grows with the number of participants, creating a structural moat that traditional product businesses cannot replicate in the same way. The framework remains useful for platform businesses, but applying it requires careful consideration of which “industry” is being analysed and how the market’s two-sided nature affects each force.
References
- Porter, M.E., “How Competitive Forces Shape Strategy”, Harvard Business Review, March-April 1979 — the original article introducing the framework
- Freight Transport Association (now Logistics UK), “Logistics Report”, 2023, https://www.logistics.org.uk — data on UK haulage operator numbers and market structure
- Bank of England / PRA, “Implementation of the Basel 3.1 Standards”, 2023, https://www.bankofengland.co.uk — capital requirements for UK banking authorisation
- British Retail Consortium, “Retail Vacancy and Footfall Reports”, 2023, https://brc.org.uk — data on UK high street vacancy rates and structural retail trends
- Groceries Code Adjudicator, “Annual Report 2022-23”, https://www.gov.uk/government/organisations/groceries-code-adjudicator — regulatory context for grocery supply chain power dynamics
- Office for National Statistics, “Construction Output Price Indices and Material Costs”, 2023, https://www.ons.gov.uk — data on UK construction material cost inflation
If you are developing a business strategy and want to run a properly structured Five Forces analysis of your market — and translate the findings into specific strategic decisions — our business consultants work through this as part of our strategic assessment process.
If the Five Forces analysis is needed as part of a business plan for investors or funding, our business plan writers incorporate competitive analysis using this framework as standard in investor-ready plans. And if you are at the early stage of evaluating whether your business idea is entering a structurally attractive market, our startup consultants can help you answer that question before you commit capital to finding out the hard way.
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Kurt Graver is the founder and CEO of SGI Consultants, a business consultancy that has helped over 2,000 entrepreneurs establish successful startups using systematic business development methodologies. An accountant with an MBA and 25 years of commerce and consultancy experience, Kurt specialises in strategic planning, market analysis, and sustainable business growth