Direct reciprocity and conditional cooperation are important mechanisms to prevent free riding in social dilemmas. But in large groups these mechanisms may become ineffective, because they require single individuals to have a substantial influence on...
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JUBA: Armed attackers have killed at least 60 people in central South Sudan, according to local officials and media, in the country’s latest deadly cattle raid. The young nation has long been plagued by violent cattle raids but is now also seeing clashes betwe…
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CNN Entertainment. 748,318 likes · 58 talking about this. Media + Entertainment news from CNN
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