The Six Forces Model: Market Analysis Beyond Porter's Five Forces
The Six Forces Model is a strategic framework that adds complementary products as a sixth force to Michael Porter's original Five Forces. It gives teams a more complete picture of industry competitiveness by accounting for how products and services outside your direct market, such as software ecosystems or accessory markets, shape profitability, buyer behavior, and strategic positioning. It is especially relevant in technology-driven and platform-based industries.
Overview
The Six Forces Model is a structural extension of one of the most influential frameworks in business strategy. Michael Porter introduced his Five Forces framework in 1979, published in the Harvard Business Review article "How Competitive Forces Shape Strategy." The original model identified five forces that determine industry profitability: rivalry among existing competitors, the threat of new entrants, the threat of substitute products, the bargaining power of buyers, and the bargaining power of suppliers. For decades, this was the default lens for market analysis. But as industries became more interconnected, especially in technology and platform markets, strategists noticed a gap. The role of complementary products, goods or services that increase the value of your offering when used together, was absent from the model. Andrew Grove, then CEO of Intel, was one of the most vocal proponents of adding a sixth force. In his 1996 book "Only the Paranoid Survive," Grove argued that complementors fundamentally alter industry dynamics in ways the original five forces cannot capture. Adam Brandenburger and Barry Nalebuff formalized similar thinking in their 1996 work "Co-opetition," introducing the concept of the "value net" where complementors sit alongside competitors, customers, and suppliers. The resulting Six Forces Model does not replace Porter's original framework. It layers on top of it. The sixth force, complementary products, captures how adjacent markets and ecosystem partners raise or lower the value of your product. Think of how the availability of quality apps affects demand for smartphones, or how the strength of a consulting ecosystem shapes the adoption of enterprise software. Without analyzing this force, a market analysis can miss the single biggest driver of value creation in platform-based or networked industries.
The mental model behind the Six Forces framework is structural. It claims that long-run profitability in any industry is not primarily determined by product quality or operational efficiency, but by the configuration of external forces pressing on every player. Each force acts as a constraint or an enabler. Rivalry compresses margins. New entrants threaten market share. Substitutes cap what you can charge. Buyer and supplier power determine how value is distributed. And complementors, the sixth force, determine how much total value exists to be distributed in the first place. This is the critical insight: complementors can expand the pie, not just change how it is sliced. In industries where complements are strong and abundant, total addressable market grows, buyer willingness to pay increases, and switching costs may rise because customers become locked into an ecosystem, not just a product.
Compared to other strategic frameworks, the Six Forces Model occupies a specific niche. SWOT analysis is broader and more internal, looking at strengths, weaknesses, opportunities, and threats without the structural discipline of force analysis. PESTEL analysis examines macro-environmental factors like political, economic, social, and technological trends, but does not zero in on industry-level competition. The Value Net model from Brandenburger and Nalebuff covers complementors but frames everything through game theory and co-opetition rather than structural forces. The Six Forces Model sits between these, offering a more complete structural view than Porter's original five while remaining more focused and actionable than broader environmental scans. For teams conducting market analysis, it is the right tool when you need to understand how your industry is structured and where profit pools concentrate or leak.
Since its emergence in the mid-1990s, the Six Forces Model has gained traction particularly in technology strategy, platform economics, and ecosystem-driven markets. The rise of cloud computing, SaaS integrations, app marketplaces, and API-first businesses has made the sixth force more relevant than ever. A company evaluating entry into a market today cannot ignore the state of its complement ecosystem, because in many sectors, the complement landscape determines adoption more than the core product itself. Teams that skip this force risk building products that are technically superior but strategically stranded, lacking the ecosystem support that drives customer acquisition and retention.
The framework benefits strategists, product leaders, investors, and competitive intelligence teams most. It is especially useful for anyone conducting a thorough market analysis before making investment decisions, entering new markets, or re-evaluating competitive positioning. The output is not a score or a ranking but a structural map of where power and value concentrate in your industry, and where they are likely to shift. Hamster provides a workspace where teams can run a Six Forces analysis collaboratively with AI agents, structuring the research, data collection, and synthesis across all six dimensions.
How It Works
Step 1: Define the industry boundaries and scope of analysis
Before analyzing any forces, you need to precisely define the industry you are examining. This sounds obvious, but it is where most analyses go wrong. "Software" is not an industry. "Cloud-based project management tools for mid-market B2B companies" is closer to a useful boundary. Define the product category, the geographic scope, the customer segments included, and the time horizon you are analyzing. A common mistake is drawing boundaries too broadly, which dilutes every subsequent force assessment because the competitive dynamics differ across segments. You know you have done this well when a colleague can read your scope definition and immediately understand what is included and excluded. One variation: some teams run parallel analyses at different scope levels, for example one at the broad industry level and one at the specific segment level, to see how structural dynamics differ.
Step 2: Assess the intensity of competitive rivalry
Map the existing competitors within your defined industry boundaries and assess how intensely they compete. Look at the number of competitors, their relative size and market share distribution, industry growth rate, product differentiation levels, switching costs, and exit barriers. High rivalry compresses margins because competitors compete on price, features, or service to win the same customers. A common mistake is listing competitors without assessing rivalry intensity. " Indicators of high rivalry include frequent price wars, rapid feature matching, high customer churn between competitors, and significant marketing spend as a percentage of revenue. Document evidence for each indicator, not just opinions. You know this step is done well when you can explain not just how intense rivalry is, but what structural factors drive that intensity.
Step 3: Evaluate the threat of new entrants
Assess how easy or difficult it is for new players to enter your industry and compete for the same customers. Key factors include capital requirements, economies of scale, brand loyalty and switching costs, access to distribution channels, regulatory barriers, and proprietary technology or data. High barriers to entry protect incumbents and support higher margins. Low barriers mean that any profitable market will attract new competitors who compress margins over time. A frequent error is underestimating the threat from adjacent markets. New entrants often do not come from startups building the same product from scratch. They come from established companies in adjacent spaces expanding into your market. The rise of vertical SaaS competitors built on horizontal platforms is a classic example. Assess both traditional entry barriers and the likelihood of adjacent-market entry.
Step 4: Analyze the threat of substitutes
Identify products or services outside your industry that solve the same customer problem in a fundamentally different way. Substitutes are not competitors within your category. They are alternatives from outside it. Spreadsheets substituting for project management software. AI-generated content substituting for human copywriting agencies. Video calls substituting for business travel. Assess the price-performance tradeoff of each substitute, switching costs for customers, and the trend direction. A substitute that is inferior today but improving rapidly is a bigger threat than one that is already mature and stable. The most dangerous substitutes are those customers do not consciously consider, they just drift toward over time. To assess this well, talk to customers who recently left your category entirely, not just those who switched to a competitor.
Step 5: Assess buyer and supplier bargaining power
Evaluate how much power buyers (your customers) and suppliers (your input providers) have to capture value from the industry. Buyer power is high when buyers are concentrated, purchase in large volumes, face low switching costs, have full price transparency, or can credibly threaten backward integration. Supplier power is high when suppliers are concentrated, offer differentiated inputs, face few substitutes for their product, or can credibly threaten forward integration. Assess each factor with data: what percentage of your revenue comes from your top five customers? How many viable suppliers exist for your critical inputs? A common mistake is treating "buyers" and "suppliers" as monolithic groups. In practice, different buyer segments and different supplier categories may have very different power levels. Segment your analysis accordingly.
Step 6: Map the complementary products force
This is the force that distinguishes the Six Forces Model from Porter's original framework. Identify the products, services, and platforms that increase the value of your offering when customers use them alongside it. Assess the availability, quality, and trajectory of these complements. Strong complements raise willingness to pay, increase adoption, and can create ecosystem lock-in. Weak or absent complements limit your market size and make substitution easier. Key questions include: how dependent are customers on complements to get full value from your product? How healthy is the complement ecosystem, is it growing or shrinking? Do you control the complement relationship, or do complement providers have the power? A critical nuance: complements can shift from allies to threats. A complement provider that grows powerful enough may integrate your functionality into their product, turning a complement into a substitute. Map not just the current state but the trajectory. See the skill page on [mapping the complementary products force](/skills/mapping-complementary-products-force) for detailed techniques.
Step 7: Synthesize forces into a structural narrative and strategic options
Bring the six individual force assessments together into a coherent structural narrative. This is not a summary slide with six scores. It is an analytical story that explains how the forces interact to create the profit landscape you observe. Which forces are the primary constraints on profitability? Which forces create opportunities? Where are structural asymmetries that specific players can exploit? From this narrative, generate three to five strategic options that address the most critical forces. For each option, articulate what structural dynamic it addresses, what it would require to execute, and what risks it carries. A common mistake is treating synthesis as averaging. An industry with low rivalry but extremely high buyer power is not "moderate" in attractiveness. The buyer power dominates the story. Synthesis requires judgment about which forces matter most and how they interact. The skill page on [synthesizing Six Forces into strategic recommendations](/skills/synthesizing-six-forces-into-strategic-recommendations) provides frameworks for this step.
When to Use
- When you are evaluating entry into a new market where platform dynamics and ecosystem health matter as much as direct competition. For example, a SaaS company considering a move into an adjacent vertical where the strength of integration partners, APIs, and complementary tools will determine whether customers adopt your product or stay with incumbents who have richer ecosystems.
- When your industry is undergoing structural disruption and you need to understand which forces are shifting and in what direction. If new substitutes are emerging from an adjacent technology category, or if supplier consolidation is changing bargaining dynamics, a Six Forces analysis maps where the structural landscape is headed, not just where it stands today.
- When you have 20 or more potential strategic initiatives competing for resources and need a shared framework for evaluating which market positions are structurally defensible. Instead of debating opinions in a strategy meeting, the Six Forces Model gives the team a common vocabulary and evidence-based criteria for comparing options.
- When your product's value depends heavily on complementary products and you need to assess the health of your complement ecosystem relative to competitors. This is common in hardware plus software markets, platform businesses, and any industry where customers buy bundles of related products from multiple vendors.
- When preparing an investment thesis or due diligence analysis and you need to explain why a specific market is structurally attractive or unattractive to stakeholders who may not have deep industry knowledge. The Six Forces Model provides a rigorous, communicable structure that goes beyond revenue projections to explain the underlying dynamics that drive margins.
When Not to Use
- When you are making a tactical decision that needs to happen this week, like choosing between two ad creatives or setting a short-term price promotion. The Six Forces Model is a structural, strategic-level framework. It takes weeks of data collection and analysis to do well. Applying it to short-cycle tactical decisions wastes time and produces analysis that is too high-level to inform the choice at hand.
- When your market is so new that none of the forces have stabilized. In genuinely nascent markets where there are fewer than five competitors, no established buyer patterns, and no identifiable complement ecosystem, the Six Forces framework produces vague, speculative output because there is not enough structural data to anchor the analysis. In these cases, discovery-oriented approaches like customer development or lean experimentation are more appropriate.
- When you need to analyze internal capabilities, culture, or operational efficiency. The Six Forces Model is entirely externally focused. It says nothing about whether your team can execute, whether your technology architecture scales, or whether your organizational design supports your strategy. For internal analysis, frameworks like VRIO or a capabilities audit are better fits.
- When you are analyzing a highly regulated monopoly or duopoly where government policy, not market structure, determines profitability. In industries like utilities, defense contracting, or government healthcare, the forces that shape profitability are primarily political and regulatory rather than competitive. PESTEL analysis or regulatory mapping will give you more useful output.
- When the team lacks the discipline or data access to assess each force rigorously and would end up producing a superficial checklist. A poorly executed Six Forces analysis is worse than none because it creates false confidence in conclusions that are not grounded in evidence. If you cannot commit to real data collection for each force, use a lighter-weight tool and be honest about the limitations.
Examples
Example: SaaS project management tool evaluating the mid-market segment
A 50-person SaaS company selling project management software to mid-market companies (200 to 2,000 employees) ran a Six Forces analysis before their annual strategy offsite. Their rivalry assessment revealed 14 direct competitors with three dominant players holding 65% market share, indicating moderate concentration but high feature parity. Buyer power was high because procurement teams at mid-market companies were sophisticated, ran formal evaluations, and faced low switching costs due to standard data export formats. Supplier power was low since their primary inputs were cloud infrastructure (commoditized) and engineering talent (competitive but not concentrated). The threat of new entrants was moderate, held back by the need for integration ecosystems but lowered by the proliferation of no-code tools enabling new competitors. Substitutes were a growing threat as spreadsheets and internal tools built on platforms like Notion gained ground. The critical finding was in the sixth force: their complement ecosystem, integrations with Slack, Jira, Salesforce, and 40 other tools, was their strongest structural advantage, far richer than smaller competitors. The team shifted strategy to double down on ecosystem depth rather than feature competition, investing 30% of engineering resources into partner integrations and API quality. Twelve months later, their win rate in competitive evaluations increased from 28% to 41%, driven primarily by integration depth as the deciding factor.
Example: Electric vehicle startup assessing a European market entry
A Chinese EV manufacturer with $2 billion in annual revenue used the Six Forces framework to evaluate entering the Western European passenger vehicle market. Rivalry was intense, with legacy automakers (VW, Stellantis, BMW) aggressively launching EV models alongside Tesla and other entrants, creating a market with over 30 EV models in the mid-range price segment. Buyer power was moderate, limited by brand loyalty and test-drive experiences but strengthened by transparent pricing comparison sites and government incentive programs that made buyers more price-sensitive. The threat of substitutes was low for the vehicle itself but notable for the transportation function, since public transit investment and ride-sharing services reduced car ownership intent among urban buyers under 35. Supplier power was high and rising for battery cells and rare earth materials, with three suppliers controlling over 60% of European battery supply. The sixth force proved decisive: the complement ecosystem, specifically charging infrastructure, varied dramatically by country. In the Netherlands and Norway, public charging density was high and standardized, lowering adoption barriers. In Italy and Spain, charging infrastructure was sparse and fragmented, meaning even a superior vehicle would face adoption resistance. The team prioritized Netherlands, Norway, and Germany for initial launch, specifically because complement strength in those markets lowered the customer acquisition cost and reduced range anxiety objections that marketing alone could not overcome.
Example: B2B fintech company defending against platform competition
A 200-person fintech company providing invoicing and payment processing to small businesses conducted a Six Forces analysis after Shopify and Square began expanding into adjacent financial services. Rivalry was high with six established players, but the more pressing concern was the threat of new entrants from platform companies. Their entrant analysis revealed that Shopify, Square, and Stripe could bundle invoicing as a free add-on to their core payment platforms, fundamentally changing the pricing dynamics. Buyer power was moderate but trending higher as small business owners became more informed through Reddit communities and YouTube reviews. Supplier power (banking partners, payment networks) was moderate and stable. Substitutes were limited since businesses needed formal invoicing for tax compliance. The complementary products analysis revealed the most actionable insight: their product's value increased dramatically when connected to accounting software (QuickBooks, Xero), banking feeds, and tax filing tools. However, their integration quality with these complements was average at best, with customers reporting that their QuickBooks sync failed 15% of the time. The strategic recommendation was to treat complement integration quality as the primary competitive moat. They hired a dedicated integrations team of eight engineers, rebuilt their top five integrations from scratch, and launched a partner program with accounting firms. The company reasoned that platform entrants would offer basic invoicing, but deep, reliable integration with the broader financial tool ecosystem was harder to replicate and more valuable to sophisticated small business owners. Within two years, customer retention improved from 82% to 91%, and the integration ecosystem became the most cited reason for choosing them in win/loss interviews.
Example: Healthcare analytics firm repositioning after regulatory change
A healthcare analytics company serving 120 hospital systems in the United States ran a Six Forces analysis after a major regulatory change expanded data-sharing requirements under the 21st Century Cures Act. Before the regulation, their key competitive advantage was proprietary data access, hospitals shared data with them under exclusive contracts. The new regulation mandated interoperability and open APIs, fundamentally weakening their supplier power advantage since the data inputs they depended on were becoming commoditized and accessible to competitors. Their analysis revealed that rivalry would intensify sharply as the data moat dissolved, with at least four well-funded startups already building on the newly accessible data streams. Buyer power was increasing because hospital CIOs could now evaluate analytics vendors based on insight quality rather than data access, and switching costs dropped. However, the complementary products force offered a path forward: hospital systems used their analytics alongside EHR systems (Epic, Cerner), population health platforms, and clinical decision support tools. None of their competitors had built deep, bidirectional integrations with these complements. The team decided to reposition from "we have the data" to "we have the best clinical workflow integrations," investing heavily in embedded analytics that surfaced insights inside the EHR systems clinicians already used daily. They acknowledged in their post-analysis review that they should have started this pivot 18 months earlier, when the regulation was first proposed. The lesson was that Six Forces analysis should be triggered by regulatory proposals, not just enacted regulations.
Skills in This Method
Selecting Tools and Templates for Six Forces Research
How to choose and configure market research tools, visualization software, and scoring templates to streamline and standardize a Six Forces analysis.
Mapping the Complementary Products Force
How to identify, evaluate, and analyze the sixth force—complementary products and services—that distinguishes the Six Forces Model from Porter's Five Forces.
Collecting Data for a Six Forces Analysis
How to design and execute a structured market research process—including surveys, secondary sources, and industry databases—to populate each of the six forces with reliable data.
Synthesizing Six Forces into Strategic Recommendations
How to combine findings from all six forces into a cohesive strategic positioning map that guides investment, partnership, and competitive strategy decisions.
Conducting an Industry Rivalry Assessment
How to systematically research and evaluate the intensity of competitive rivalry within an industry using both qualitative and quantitative market research methods.
Evaluating Buyer and Supplier Bargaining Power
How to gather primary and secondary market research data to assess the bargaining power of buyers and suppliers as distinct forces shaping industry profitability.
Assessing Threats of New Entrants and Substitutes
How to use consumer market research and competitive intelligence to quantify the threats posed by new market entrants and substitute products or services.