Cooperation is a behavior apparently opposed to natural selection, however it is possible of comparation if we understand as a mechanism by which individuals can increase aptitude. This behavior has been investigated by the evolutionist psychologists whom identify some reasons for its existence such as the kinship election, the reciprocal altruism and the indirect reciprocal altruism. Very little evolutionist studies have been developed with children. Thus, the objective of this work was to analyze reports which corroborate with evolutionist findings, identified in adults. It was observed that, in the reports, one can identify examples of the kinship election, the reciprocal altruism and the indirect reciprocal altruism, as well as the importance of reputation to trigger cooperative behavior of the game partners.
free riders; cooperation; games theory