But we venture to assert that the study of canonist economics, far from being useful simply as an introduction to later theories, is of great value in furnishing us with assistance in the solution of the economic and social problems of the present day. The last fifty years have witnessed a reaction against the scientific abstractions of the classical economists, and modern thinkers are growing more and more dissatisfied with an economic science which leaves ethics out of account.[1] Professor Sidgwick, in his _Principles_ _of Political Economy_, published in 1883, devotes a separate section to 'The Art of Political Economy,' in which he remarks that 'The principles of Political Economy are still most commonly understood even in England, and in spite of many protests to the contrary, to be practical principles--rules of conduct, public or private.'[2] The many indications in recent literature and practice that the regulation of prices should be controlled by principles of 'fairness' would take too long to recite. It is sufficient to refer to the conclusion of Devas on this point: 'The notion of just price, worked out in detail by the theologians, and in later days rejected as absurd by the classical economists, has been rightly revived by modern economists.'[3] Not alone in the sphere of price, but in that of every other department of economics, the impossibility of treating the subject as an abstract science without regard to ethics is being rapidly abandoned. 'The best usage of the present time,' according to the _Catholic Encyclopædia_, 'is to make political economy an ethical science--that is, to make it include a discussion of what ought to be in the economic world as well as what is.'[4] We read in the 1917 edition of Palgrave's _Dictionary of Political Economy_, that 'The growing importance of distribution as a practical problem has led to an increasing mutual interpenetration of economic and ethical ideas, which in the development of economic doctrine during the last century and a half has taken various forms.' [5] The need for some principle by which just distribution can be attained has been rendered pressing by the terrible effects of a period of unrestricted competition. 'It has been widely maintained that a strictly competitive exchange does not tend to be really fair--some say cannot be really fair--when one of the parties is under pressure of urgent need; and further, that the inequality of opportunity which private property involves cannot be fully justified on the principle of maintaining equal freedom, and leads, in fact, to grave social injustice.'[5] In other words, the present condition of affairs is admitted to be intolerable, and the task before the world is to discover some alternative. The day when economics can be divorced from ethics has passed away; there is a world-wide endeavour to establish in the place of the old, a new society founded on an ethical basis.[7] There are two, and only two, possible ways to