Why do people help strangers when there is a low probability that help will be directly reciprocated or socially rewarded. A possible explanation is that these acts are contagious: those who receive or observe help from a stranger become more likely to help others. We test two mechanisms for the social contagion of generosity among strangers: generalized reciprocity (a recipient of ge... https://foldlyers.shop/product-category/monitor-brackets/