“Evolutionary game theory is a way of thinking about evolution at the phenotypic level when the fitnesses of particular phenotypes depend on their frequencies in the population.”

—  John Maynard Smith, book Evolution and the Theory of Games

Source: Evolution and the Theory of Games (1973), p. 1.

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John Maynard Smith9
British theoretical evolutionary biologist and geneticist 1920–2004

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“The theory of games was first formalised by Von Neumann & Morgenstern (1953) in reference to human economic behaviour. Since that time, the theory has undergone extensive development… Sensibly enough, a central assumption of classical game theory is that the players will behave rationally, and according to some criterion of self-interest. Such an assumption would clearly be out of place in an evolutionary context. Instead, the criterion of rationality is replaced by that of population dynamics and stability, and the criterion of self-interest by Darwinian fitness.”

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“Minds are in limited supply, and each mind has a limited capacity for memes, and hence there is considerable competition among memes for entry in as many minds as possible. This competition is the major selective force in the memosphere, and, just as in the biosphere, the challenge has been met with great ingenuity. For instance, whatever virtues (from our perspective) the following memes have, they have in common the property of having phenotypic expressions that tend to make their own replication more likely by disabling or preempting the environmental forces that would tend to extinguish them: the meme for faith, which discourages the exercise of the sort of critical judgment that might decide that the idea of faith was, all things considered a dangerous idea; the meme for tolerance or free speech; the meme of including in a chain letter a warning about the terrible fates of those who have broken the chain in the past; the conspiracy theory meme, which has a built-in response to the objection that there is no good evidence of a conspiracy: "Of course not — that's how powerful the conspiracy is!" Some of these memes are "good" perhaps and others "bad"; what they have in common is a phenotypic effect that systematically tends to disable the selective forces arrayed against them. Other things being equal, population memetics predicts that conspiracy theory memes will persist quite independently of their truth, and the meme for faith is apt to secure its own survival, and that of the religious memes that ride piggyback on it, in even the most rationalistic environments. Indeed, the meme for faith exhibits frequency-dependent fitness: it flourishes best when it is outnumbered by rationalistic memes; in an environment with few skeptics, the meme for faith tends to fade from disuse.”

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“Creationists habitually misdefine their terms, and commonly insist that evolution means “life from non-life”. But of course that’s not right either. Evolution explains how life diversifies, not how it began. Since evolution at every level is -by definition- limited to the variation of allele frequencies inherited over generations of living organisms, then it obviously can’t operate where no genomes yet exist. The evolutionary process starts with genetics and can’t start before it.”

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“Game theory concepts were first explicitly applied in evolutionary biology by Lewontin (1961). His approach, however, was to picture a species as playing a game against nature, and to seek strategies which minimised the probability of extinction. A similar line has been taken by Slobodkin & Rapoport (1974). In contrast, here we picture members of a population as playing games against each other, and consider the population dynamics and equilibria which can arise.”

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“They, economics and evolution, are both examples of a larger process, which has been at work in this part of the universe for a very long time. This is the process of the development of structures of increasing complexity and improbability. The evolutionary process always operates through mutation and selection and has involved some distinction between the genotype which mutates and the phenotype which is selected. The process by which the genotype constructs the phenotype may be described as "organization". Economic development manifesto itself largely in the production of commodities, that is, goods and services. It originates, however, in ideas, plans, and attitudes in the human mind. These are the genotypes in economic development. This whole process indeed can be described as a process in the growth of knowledge. What the economist calls "capital" is nothing more than human knowledge imposed on the material world. Knowledge and the growth of knowledge, therefore, is the essential key to economic development. Investment, financial systems and economic organizations and institutions are in a sense only the machinery by which a knowledge process is created and expressed.”

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