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Experiments in Economics: Playing fair with money cookbooks measure your hat size withAre humans fair by nature? Why do we often willingly trust strangers or cooperate with them even if those actions leave us vulnerable to exploitation? Does this natural inclination towards fairness or trust have implications in the market place? Traditional economic theory would perhaps think not, perceiving human interaction as self interested at heart. There is increasing evidence however that social norms and norm driven behaviour such as a