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Equivalent Retaliation Protocol
Equivalent Retaliation Protocol -- or "tit for tat" -- an aspect of game theory developed by Anton Rapoport in the 1980's.  It's a strategy for cooperative behavior in which an individual, at each stage, plays the action last played by another against it.
More information

See also:

Australian Broadcasting Corp
-- detailed essay on "tit for tat" and it's importance in cooperative societies
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