Arenas, Not Industries

Definition

McGrath argues that "industry" is too coarse a unit of strategic analysis once advantages are transient, because it assumes competitors are firms offering close substitutes within the same category. She proposes the arena — a granular combination of a specific customer segment, a specific offer, and a specific geography, organized around the "job to be done" rather than a product category — as the real unit at which competitive battles are actually fought and won.

In the Book

Chapter 1 catalogs how within-industry thinking blindsides incumbents: no money-center bank saw Merrill Lynch's cash management account coming in the 1980s because Merrill wasn't a bank; Google's move into phone operating systems and video, Walmart's move into health care, and mobile carriers, internet credit firms, and card networks all converging on payments are framed as arena collisions rather than industry rivalries. McGrath contrasts industry-based strategy with chess — a fight for checkmate within one bounded game — against arena-based strategy with the game of Go, where the goal is territorial capture across many simultaneous local contests. The book's running example is language-training firm Berlitz: in Brazil, Berlitz competed for a fierce mass market but a nearly uncontested upper-income segment, so it positioned itself there as an elite brand; in the United States, with a broad middle-income customer base, it instead competed on convenience and flexibility — two different arena strategies executed under one company, both feeding a longer-term evolution toward becoming a cultural consultancy.

Why It Matters

Mapping arenas instead of industries surfaces threats and openings that industry classification hides by construction — a competitor who doesn't share your SIC code but serves the same job-to-be-done for the same customer will not show up in a five-forces analysis until it's too late. It also legitimizes running genuinely different strategies for different slices of what looks, at the industry level, like a single market.