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    The 'unstable equilibrium' characterization of three-coop... — Carmelics
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    Challenges→Isolated cooperators and small groups of cooperators (fewer than four) face extinction in a spatial prisoner's dilemma

    The 'unstable equilibrium' characterization of three-cooperator groups assumes a static spatial lattice, but Axelrod's iterated tournament results show that small cooperative clusters stabilize through reciprocal interaction history rather than instantaneous fitness comparisons.

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    Key Terms

    Axelrod(the researcher whose experiments are being referenced)
    Robert Axelrod, a political scientist and game theorist famous for running computer tournaments to study how cooperation evolves through repeated interactions.
    Fitness(Rough gloss used in the context of evolutionary altruism.)
    A measure of how many descendants an organism will have.
    Iterated tournament(Axelrod's famous experiments studying cooperation)
    A repeated competition where the same players face off multiple times, so past interactions affect future outcomes—the opposite of a single one-time match.
    Reciprocal interaction history(explaining why small groups of cooperators survive together)
    The record of back-and-forth exchanges between individuals that influences how they treat each other going forward.

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    Spatial lattice(referring to the static setup in game theory models)
    A grid or checkerboard-like arrangement where things are placed in fixed positions and interact only with their neighbors.
    Unstable equilibrium(describing the state of groups with three cooperators)
    A situation that seems balanced on the surface but will fall apart if anything changes slightly—like balancing a pencil on its point.

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    Consequentialism1 linkedMoral Responsibility1 linked

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    Isolated cooperators and small groups of cooperators (fewer than four) face exti...

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