Why the Five Forces Still Rule in an AI-Driven Market

Here’s a number that should stop you cold: 83% of market research professionals planned to invest in AI in 2025 (Similarweb / Research and Markets). That’s nearly everyone. And honestly, I get it—AI can crunch data faster than any human, and it’s tempting to think that’s all we need. But as an industry analyst, I’m here to tell you that’s a dangerous delusion. The real skill isn’t processing data; it’s interpreting the competitive forces that determine whether your industry is worth being in at all. That’s why I still start every analysis with Porter’s Five Forces, and you should too.

What is industry analysis, and why does it matter?

Industry analysis is the art of understanding the competitive dynamics that shape profitability in a given market. It’s not just about knowing your customers or your product; it’s about seeing the whole playing field—the suppliers, the buyers, the substitutes, the new entrants, and the rivalry among existing players. The CFA Institute puts it bluntly: the stronger these forces, the lower the industry’s profit potential. If you ignore them, you’re flying blind. I’ve seen too many startups raise millions only to discover they’ve entered a market where the forces are so strong that profits get squeezed to nothing.

Isn’t PESTLE enough to understand the market?

No, and here’s the thing: PESTLE and Five Forces answer different questions. PESTLE looks at the macro environment—political, economic, social, technological, legal, and environmental factors (Washington State University Libraries). It’s useful for spotting threats and opportunities, like a new regulation or a demographic shift. But it doesn’t tell you how much power your suppliers have or how likely a new entrant is to disrupt you. The CFA Institute recommends using both: PESTLE to understand the external trends, and Five Forces to interpret the competitive environment. They’re complementary, not substitutes. I’ve seen companies do a thorough PESTLE and then wonder why their margins are still terrible—because they never looked at the supplier power in their industry.

What are the five forces, exactly?

Let’s quickly run through them: threat of new entrants, threat of substitutes, supplier power, buyer power, and competitive rivalry. Each one can drain away the value your industry creates. Porter’s 2008 Harvard Business Review article explains that the five forces determine how the economic value an industry creates is apportioned—it can be bargained away by suppliers or customers, constrained by new entrants or substitutes, or dissipated through rivalry. That’s the core insight: industry profitability isn’t just about your own strategy; it’s about the negotiation power of everyone around you.

What’s the biggest misconception about market analysis?

The biggest misconception I see is that market analysis is just about forecasting growth rates. People get fixated on CAGR—the compound annual growth rate—and think that a high CAGR means a good market. But growth is only one piece of the puzzle. I’ve seen industries with double-digit growth where nobody makes money because the rivalry is brutal and buyers have all the power. Conversely, a slow-growing industry can be highly profitable if the five forces are weak. The real question isn’t “how fast is it growing?” but “who captures the value?” That’s what Five Forces tells you. So don’t let a flashy growth number blind you to the underlying competitive reality.

How do I define the right market for analysis?

This is trickier than it sounds. The European Commission’s revised Notice on market definition emphasizes that the relevant product market includes all products that customers regard as interchangeable or substitutable, with demand-side substitutability being the most important criterion. And the geographic market is the area where competition conditions are sufficiently homogeneous. Getting this wrong can ruin your analysis. If you define your market too narrowly, you miss substitutes; too broadly, you dilute the forces. For example, if you’re analyzing the market for ride-hailing apps, do you include taxis? Public transit? Walking? The correct answer depends on what customers actually see as alternatives. I’ve seen analysts define a market based on a company’s product category rather than customer substitution patterns, and then they wonder why their Five Forces analysis doesn’t match reality.

Are complements a sixth force?

This is a classic debate. Porter himself argues no—complements are not a sixth force because their impact runs through the five forces (Harvard Business Review). But Brandenburger and Nalebuff, in their Yale working paper, counter that complements are symmetric to substitutes “up to a sign change,” so they should be treated as a force on exactly the same footing. They argue that including complements makes the framework more logically complete and more valuable. I agree with them. Think about the hardware and software industries: each makes the other more attractive, and they can raise each other’s willingness to pay. If you ignore complements, you miss a critical dynamic that can shape an industry’s profitability. So while I respect Porter, I’m with the co-opetition crowd on this one—treat complements as a real force.

How do I measure industry concentration?

For a quick, quantitative take, use the Herfindahl-Hirschman Index (HHI). It’s the sum of the squares of market shares of all firms in the market, ranging from near zero in fragmented markets to 10,000 in a monopoly (US DOJ Antitrust Division). The 2023 Merger Guidelines say a market is “moderately concentrated” if HHI is between 1,000 and 1,800, and “highly concentrated” above 1,800. This is a great tool for understanding the competitive structure. But don’t rely on it alone. HHI tells you about concentration, not about the other forces. A concentrated market can still have powerful buyers, for instance. Use it as a diagnostic, not a verdict.

How do I avoid getting “stuck in the middle”?

Porter’s generic strategies—cost leadership and differentiation—are the classic ways to position yourself. But the danger is being “stuck in the middle,” where you don’t have unique features to justify a premium price, and you’re not cheap enough to compete on cost (University of Central Florida Pressbooks). I see this all the time with mid-tier brands that try to be everything to everyone. They end up with average products and average prices, and they get crushed by both the low-cost players and the high-end differentiators. The solution is to make a choice. Are you going to be the cost leader or the differentiator? Pick one and commit. As Porter said, strategy is as much about what you’re not going to do as what you are going to do.

What’s the most important thing to remember?

The most important thing is that industry analysis is not a one-time exercise. Markets change, and so do the five forces. I’ve seen industries transform in a few years—like how the rise of videoconferencing became a substitute for travel, hitting the airline industry’s profitability (Harvard Business Review). So, keep your analysis fresh. And remember, the goal is to understand where value is created and who captures it. That’s the insight that will guide your strategic decisions.

In the end, don’t let the latest AI hype distract you from the fundamentals. Yes, 83% of your peers are investing in AI, and 47% already use it regularly in research (Similarweb / Research and Markets). But AI is a tool, not a strategy. Use it to gather data faster, but use your judgment to interpret the forces. That’s what makes you an analyst, not just a data processor.

Sources

• CFA Institute - Industry and Competitive Analysis
• Harvard Business Review - The Five Competitive Forces That Shape Strategy
• Brandenburger & Nalebuff (Yale SOM) - Symmetry and the Sixth Force
• US DOJ Antitrust Division - Herfindahl-Hirschman Index
• Similarweb / Research and Markets - Market Research Stats