The history of strategy — from Porter's five forces to Greenwald's one force
Chapter 1 of 16 · 12 min
Competition Demystified (2005) by Bruce Greenwald and Judd Kahn is a frontal reaction to thirty years of strategy literature. To understand how radical the book is, you must first know what it is reacting against — and nobody weighs heavier there than Michael Porter. Chapter 1 puts the history on the table and presents the reduction that the whole course is built on.
The history first, cited openly. Strategy as a subject was born in the 1960s in strategic planning departments and consultancies — BCG's experience curves, portfolio matrices, long-range plans. The breakout came with Michael Porter at Harvard: the article How Competitive Forces Shape Strategy (Harvard Business Review, 1979) and the book Competitive Strategy (1980). Porter's point was structural: a company's profitability is determined not primarily by its executives or its products but by the structure of the industry, and the structure is analyzed in five forces — the threat from new entrants, the threat from substitutes, the rivalry among existing competitors, the bargaining power of suppliers and the bargaining power of buyers.
The five forces model became the world's most used industry analysis framework, and for good reason: it forces the analyst to look beyond the company itself.
Greenwald and Kahn's reduction, rendered fairly. The book's starting point is empirical: competition is omnipresent and the overwhelming majority of companies earn no excess return at all. When the authors then ask which of Porter's five forces actually carries profitability, the answer is: ONE. The barriers to entry — what they call the incumbency advantage, the established player's precedence. The four remaining forces are in practice side effects. Without barriers: rivalry becomes relentless (equal competitors knock out each other's surpluses), buyers and suppliers capture the remnants and substitutes set the ceiling.
With barriers: the incumbent is protected, competitors do not get in, and rivalry, buyer power and supplier power are automatically dampened. The first and decisive question of strategy analysis is therefore not which five forces apply — but the only one: is there a barrier to entry, or not?
Honesty in both directions, which the course keeps all the way to the controversy chapter. The strength of the Porter camp is breadth: five forces analysis — a fleet of forces rather than a single thrust — makes the entire ecosystem visible: supply chains, buyer consolidation, complements (which Porter himself later added to the discussion). In industries where buyer power reigns — pharmaceuticals' price-pressuring payers, chapter 13 — forces beyond entry genuinely play an independent role. Greenwald's answer is the focusability (one question you can ask first, about everything) and the testability (barriers are read off in measurable series: market share and return — chapter 10).
The course's position in the AK1A ark: the VIG course is the valuation process (the EPV staircase), the Dorsey course is the moat list — this book is the SCIENCE OF MOATS, the barriers in nine steps. AKM1 bridge: V13 Patents and intangible rights, V14 Brand and customer loyalty, V15 Network effects — the whole moat trio — with the persistence test in the V09 ROE series and the market definition in V03.