Invasion by a Tit-for-Tat Minority

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Agents as Countries on a Toroidal Planet

Throughout the more recent slides of this tutorial, we show several scenarios of agent strategy invasion. Here we suggest a reality-based example that comes closest to our simulations. The example might help understand some of these simulations' premises and results.

We might imagine the agents as countries on a Toroidal planet. These countries interact with each other by the rules of the Iterated Prisoner's Dilemma, and from time to time switch their political strategies to those of successful partners. An example of a Prisoner's Dilemma interaction may be the use of a lake that lies on the border between two countries. Both nations would benefit from the lake's cleanliness, yet each one also wants to dump refuse and industrial waste in its waters. In this case, cooperation and defection correspond to the amount of restraint each country employs in soiling the environment.

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