Abstract
The focus of this chapter is on the Iterated Prisoners’ Dilemma and Robert Axelrod’s “Tournament of Strategies.” If a Prisoners’ Dilemma is repeated and the repetitions are with “unforeseeable end,” then an equilibrium exists that implies “cooperation” in every round of the supergame. This result is the most prominent implication of the Folk Theorem formalizing “what we have always known.” An obvious condition of achieving this “favorable result” is that the players appreciate future benefits and do not discount them too heavily. Another condition is that players know that this also applies to their opponents. In Axelrod’s tournament, strategies are randomly matched in pairs. The strategies prescribe the decision in each period for a finite number of periods. For instance, the winning strategy, i.e., TIT-FOR TAT, proposes that the player “cooperates” in the first period and repeats this choice in the following periods as long as the strategy of the opponent chooses “cooperate.” However, if the strategy selects “defect,” then TIT-FOR TAT presents “defect” as well. The strategy resulting in the largest sum of payoff points wins. This condition is different than what defines success in the Iterated Prisoners’ Dilemma.
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Notes
- 1.
In Germany, Christmas presents are supposed to arrive on December 24, i.e., Christmas Eve.
- 2.
For an extended discussion and alternative examples of supergames, see Friedman (1986: 85–112).
- 3.
There were the additional strategies RANDOM and “Anonym” in the first round and, again, RANDOM in the second round.
- 4.
Such a complexity creates Hobbesian uncertainty and excludes cooperation. If others think they cannot influence you, there is no reason for them to cooperate with you—and for you there is no possibility to cooperate with them.
- 5.
The volume contains Holler (1986) that analyzes the capacity of the Prisoners’ Dilemma and the Volunteer’s Dilemma to illustrate Adam’s concepts of moral sentiments and self-interest with respect to their capacity to bring about “fair and reasonable” social decisions.
- 6.
Eteocles was King of Thebes. Polyneices challenged him attacking the city. “Eteokles, they say, with due observance of right and custom, he hath laid in the earth, for his honour among the dead below. But the hapless corpse of Polyneices—as rumour saith, it hath been published to the town that none shall entomb him or mourn, but leave unwept, unsepulchred, a welcome store for the birds, as they espy him, to feat on at will” (Sophocles, lines 22-31).
- 7.
Antigone’s decision concurs with the status and power of the dead as described by Fustel de Coulange (2006 [1864]) in his seminal study The Ancient City.
- 8.
It is only consequent that “various categories were exempted from rappresoglio: ambassadors, pilgrims to the Holy Land, students of the University of Bologna (by a special decree of Frederic Barbarossa in 1158) and, in some cities, merchants” (Origo 1957: 40).
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Holler, M.J., Klose-Ullmann, B. (2020). Forever and a Day. In: Scissors and Rock. Springer, Cham. https://doi.org/10.1007/978-3-030-44823-3_9
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