[Footnote 3: _De Cont._ We have here a recognition of the principle that the value of labour is not to be measured by anything extrinsic to itself, _e.g._ by the value of the product, but by its own natural function and end, and this function and end is the supplying of the requirements of human life. The wage must, therefore, be capable of supplying the same needs that the expenditure of a labourer's energy is meant to supply. (See Cronin, _Ethics_, vol. ii. p. 390.)] [Footnote 4: Brants, _op. cit._, p. 118.] [Footnote 5: The passages from the _Summa_ of Antoninus bearing on the subject are reprinted in Brants, _op. cit._, p. 120.] [Footnote 6: _Op. cit._, p. 125.] [Footnote 7: Brants, _op. cit._, p. 116, quoting _Le Lime du Trésor_ of Brunetto Latini.] § 5. _Value of the Conception of the Just Price_. It is probably correct to say that the canonical teaching on just price was negative rather than positive; in other words, that it did not so much aim at positively fixing the price at which goods should be sold, as negatively at indicating the practices in buying and selling which were unjust. 'The doctrine of just price,' according to Dr. Ryan, 'may sometimes have been associated with incorrect views of industrial life, but all competent authorities agree that it was a fairly sound attempt to define the equities of mediæval exchanges, and that it was tolerably successful in practice.'[1] The condition of mediæval markets was frequently such that the competition was not really fair competition, and consequently the price arrived at by competition would be unfair either to buyer or seller. 'This,' according to Dr. Cunningham, 'was the very thing which mediæval regulation had been intended to prevent, as any attempt to make gain out of the necessities of others, or to reap profit from unlooked-for occurrences would have been condemned as extortion. It is by taking advantage of such fluctuations that money is most frequently made in modern times; but the whole scheme of commercial life in the Middle Ages was supposed to allow of a regular profit on each transaction.'[2] There might be some doubt as to the positive justice of this or that price; but there could be no doubt as to the injustice of a price which was enhanced by the necessities of the poor, or the engrossing of a vital commodity.[3] Merely to buy up the whole supply of a certain commodity, even if it were bought up by a 'ring' of merchants, provided that the commodity was resold within the limits of the just price, was not a sin against justice, though it might be a sin against charity.[4] If the authorities granted a monopoly, they must at the same time fix a just price.[5] A monopoly which was not privileged by the State, and which had for its aim the raising of the price of goods above the just price was regarded with universal reprobation.[6] 'Whoever buys up corn, meat, and wine,' says Trithemius, 'in order to drive up their price and to amass money at