The third assumption, and by far the most pernicious, is a behavioral model that describes human beings as something called " homo economicus, " which basically means that we are all perfectly selfish, perfectly rational and relentlessly self-maximizing.

第三个假设， 也是迄今为止最有害的假设， 是一种行为模型，它将人类描述为所谓的“经济人” ，这基本上意味着我们都是完全自私的， 完全理性的， 并且无情地自我最大化。