One assumption,  often unstated, in the economics we teach at the introductory and intermediate levels is the absence of force. Another assumption that we typically take a while to unpack is the rule of law and property rights. And still a third assumption is the cultural context of what is fair game to be traded in a society. I want to talk a little bit about where they show up in the context of two key ideas in the undergraduate-level canon, general equilibrium theory and externality theory.

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