Some arguments against the assumption that ordinary people may share common knowledge are sound. The apparent cost of such arguments is the rejection of scientific theories that appeal to common knowledge. My proposal is to accept the arguments without rejecting the theories. On my proposal, common knowledge is shared by ideally rational people, who are not just mathematically simple versions of ordinary people. They are qualitatively different from us, and theorizing about them does not lead to predictions about our behavior. Nevertheless, models of action that assume common knowledge have a role to play in our understanding of collective rationality.

中文翻译：

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谁害怕常识？

一些反对普通人可能拥有共同知识这一假设的论点是合理的。这种争论的明显代价是拒绝诉诸常识的科学理论。我的建议是接受论点而不拒绝理论。根据我的建议，常识是由理想理性的人共享的，他们不仅仅是普通人的数学简单版本。他们在本质上与我们不同，对他们的理论并不能导致对我们行为的预测。然而，假设常识的行动模型在我们对集体理性的理解中发挥着作用。