Reciprocal altruism is probably one of our strongest instincts,
expecting fairness and a good deal, you know how bad it feels when you
think you were cheated?
In evolutionary biology, reciprocal altruism is a form of altruism in
which one organism provides a benefit to another in the expectation of
future reciprocation. This is equivalent to the Tit for tat strategy
in game theory. It would only be expected to evolve in the presence of
a mechanism to identify and punish "cheaters". An example of
reciprocal altruism is blood-sharing in the vampire bat, in which bats
feed regurgitated blood to those who have not collected much blood
themselves knowing that they themselves may someday benefit from this
same donation; cheaters are remembered by the colony and ousted from
this collaboration.
In a series of ground-breaking contributions to biology in the early
1970s Robert Trivers introduced the theories of reciprocal altruism
(1971), parental investment (1972), and parent-offspring conflict
(1974). Trivers' paper "The Evolution of Reciprocal Altruism" (1971)
elaborates the mathematics of reciprocal altruism and includes human
reciprocal altruism as one of the three examples used to illustrate
the model, arguing that "it can be shown that the details of the
psychological system that regulates this altruism can be explained by
this model." In particular, Trivers argues for the following
characteristics as functional processes subserving reciprocal
altruism:
http://en.wikipedia.org/wiki/Reciprocal_altruism
> In modern society, those projections come at you from all angles.
