Glossary · Game Theory
Evolutionarily Stable Strategy
also: ESS · evolutionary game theory · replicator dynamics · hawk-dove game · frequency-dependent selection
Definition
An evolutionarily stable strategy is one that, once adopted by a population, cannot be invaded by any rare alternative. Maynard Smith and Price (1973) introduced it to explain restraint in animal conflict; applied to markets it explains why competitors converge on identical positioning and why a deviant strategy pays only if it reaches critical mass before it is copied.
Evolutionary game theory drops the assumption that players reason. Strategies spread according to replicator dynamics: whatever earns above-average payoff grows its share of the population. The hawk-dove game is the workhorse: when the cost of fighting exceeds the value of the prize, the stable state is a mixture of aggressive and conciliatory play, not the victory of either. Marketing categories behave the same way. Once most firms run the same playbook, the payoff to any one firm of deviating depends on how many others deviate, which is frequency-dependent selection. Hotelling (1929) supplies the spatial version, minimum differentiation, and d'Aspremont, Gabszewicz, and Thisse (1979) the correction under which firms separate. The framework predicts convergence, cycles, and the narrow windows in which a mutant strategy can take over.
Essays on this concept
- Marketing Strategy
Evolutionary Game Theory for Marketing Strategy: Why Categories Converge on One Playbook, and When Deviating Pays
Every SaaS site and DTC brand converges on one playbook because strategy spreads by imitation, not reasoning. Evolutionary game theory predicts convergence, cycles, and the narrow window where deviating actually pays.
- Marketing Strategy
Category Entry Points: A Quantitative Approach to Byron Sharp's Mental Availability Theory
Brands don't compete for preference. They compete for mental availability - being thought of in the buying situation. Category Entry Points are the specific occasions, needs, and contexts that trigger category thoughts. Most brands measure the wrong ones.
- Digital Economics
Winner-Take-Most vs. Multi-Homing: An Empirical Analysis of Market Concentration in Vertical SaaS
The 'winner-take-all' narrative dominates SaaS strategy. But empirical data across 20+ vertical categories tells a different story: most B2B software markets stabilize with 3-5 serious players, and switching costs are falling faster than incumbents realize.
- Game Theory
Coordination Games and Standards Wars: How Products Win When Everyone Has to Move at Once
A launch that needs suppliers, developers, and buyers to move at once is a coordination game with many equilibria. Expectations pick the winner: VHS reached 80 percent of production by 1984, though Betamax led first.
Related concepts
Authoritative references