 Olivi treats just price in a similar way as usus pauper: it cannot be a pre-fixed and universally applicable single point but there must be some amount of latitude and flexibility to it. He adopts the Aristotelian idea of virtuous action as a middle-point between two opposing vices: just as virtue is not a fixed middle that can be known a priori but depends on the context and situation, so just price has limits but is open to variation due to various contextual factors. (Piron 2012, p. 45.) There are normative limits for the just price—for instance, vital needs may force the buyer to agree on a price that is unjust, but the seller should refrain from asking more than a fair price. Yet, the flexibility of the limits of just price leave room for economic activity and allow merchants to profit, and within these limits the participants agree on the price freely. Olivi also submits that if neither party deceives the other and both enter the transaction freely (no compelling circumstances obtain), one may even give away one’s commodities for free.