It can be useful, in an economic sense, to observe what it is that people are discussing rather than the details of how they are discussing it. This applies outside economics of course: if people are discussing how many angels can dance on a pinhead then we know that people have presupposed the existence of angels. That medieval debate was actually about whether angels were corporeal, and thus confined by space, or non-corporeal and thus not. But that detail isn’t the interesting observation from afar: that people both assumed the existence of angels and that it was important to discuss aspects of them, not their existence, tells us something about that society.
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