History and Commerce_, Dr. Cunningham showed that he profoundly misunderstood the doctrine of the just price; the objectivity which he attributed to it was not the objectivity ascribed to it by the scholastics. It was to correct this misunderstanding that Father Slater contributed an article to the _Irish Theological Quarterly_[2] pointing out that the just price was subjective rather than objective. This article, which was afterwards reprinted in _Some Aspects of Moral Theology_, and the conclusions of which were embodied in the same writer's work on Moral Theology, was controverted in a series of articles by Father Kelleher in the _Irish Theological Quarterly_.[3] [Footnote 1: Pp. 77-9.] [Footnote 2: Vol. iv. p. 146.] [Footnote 1: 'Market Prices,' vol. ix. p. 398 and vol. x. p. 163; and 'Father Slater on Just Price and Value,' vol. xi. p. 159.] Father Slater draws attention to the fact that Dr. Cunningham overlooked to some extent the importance of common estimation in arriving at the just price. He points out that, far from objects being invested with some immutable objective value, their value was in fact determined by the price which the community as a whole was willing to pay for them: 'As the value in exchange will be determined by what the members of the community at the time are prepared to give, ... it will be determined by the social estimation of its utility for the support of life and its scarcity. It will depend upon its capacity to satisfy the wants and desires of the people with whom commercial transactions are possible and practicable. Father Slater then goes on categorically to refute Dr. Cunningham's presentation of the objectivity of price: 'All that that doctrine asserts is that there should be, and that there is, an equivalent in social value between the commodity and its price at a certain time and in a certain place; it says nothing whatever about the stability or permanence of prices at different times and at different places. By maintaining that the just price did not depend upon the valuation of the individual buyer or seller the mediæval doctors did not dream of making it intrinsic to the object.' In the work on Moral Theology, to which we have referred, expressions occur which lead one to believe that Father Slater did not see any great difference between the mediæval just price arrived at by common estimation and the modern normal or market price arrived at by open competition. Thus, in endeavouring to correct Dr. Cunningham's misunderstanding, Father Slater seems to have gone too far in the other direction, and his position has been ably and, in our judgment, successfully, controverted by Father Kelleher.