This question <131|337> overall <135|138> Hans: <132|157>.

Question 196: Aristotle wrote: ‘There can be no exchange without equality, and no equality without commensurability.’ What does he mean by this? What is the difference between equality and commensurability?

[137] Hans: Aristotle.   “There can be no exchange without equality” means that every exchange is an act by which the two things exchanged are equalized. “There can be no equality without commensurability” means that two things can only be equalized if they have something in common.

“Commensurable” means “measurable by the same yardstick,” i.e., the things are in certain respects of equal quality. This does not necessarily mean that they are equal, because their quantity may be different.

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