The just price, then, in the absence of a legal fixing, was held to be the price that was in accordance with the _communis estimatio_. Of course, this did not mean that a plebiscite had to be taken before every sale, but that any price that was in accordance with the general course of dealing at the time and place of the sale was considered substantially fair. 'A thing is worth what it can generally be sold for--at the time of the contract; this means what it can be sold for generally either on that day or the preceding or following day. One must look to the price at which similar things are generally sold in the open market.'[1] 'We must state precisely,' says the Abbé Desbuquois, 'the character of this common estimation; it did not mean the universal suffrage; although it expresses the universal interest, it proceeds in practice from the evaluation of competent men, taken in the social environment where the exchange value operates. If one supposes a sovereign tribunal of arbitration where all the rights of all the weak and all the strong economic factors are taken into account, the just price appears as the sentence or decision of this court.'[2] 'For the scholastics, the common estimation meant an ethical judgment of at least the most influential members of the community, anticipating the markets and fixing the rate of exchange.'[3] [Footnote 1: Caepolla, _De Cont. Sim._, 72.] [Footnote 2: _Op. cit._, pp. 169-70.] [Footnote 3: Fr. Kelleher in the _Irish Theological Quarterly_, vol. xi. p. 133.]