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We study agent societies where self-interested agents interact repeatedly over extended time periods. In particular, we are interested in environments where agents can form mutually beneficial relationships by exchanging help but an agent would rather receive help than give it. Evolutionary tournaments with competing help-giving strategies can model scenarios where agents periodically adopt strategies that are outperforming others in the population. Such experiments, however, can bedoi:10.1145/1082473.1082636 dblp:conf/atal/SahaS05 fatcat:n5clh27wxbfxbnemroi3qy2of4