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Social behaviours such as cooperation or cheating are often studied using economic games, as for example, the Prisoner's Dilemma, the Dictator Game or the Public Goods Game. Findings from these studies have broad societal implications as they tell how individuals interact with each other in situations in which one's own interest directly competes with another's. Understanding factors encouraging prosocial behaviour can help us create environments that encourage cooperation and collaboration, such as in the workplace or in school, highlighting the relevance of this research. This Collection gathers some of the most recent research using economic games to study social behaviour.