Far more important than its teaching either on production or consumption was the teaching of the mediæval Church on distribution, which it insisted must be regulated on a basis of strict justice. It is in this department of economic study that the teaching of the mediævals appears in most marked contrast to the teaching of the present day, and it is therefore in this department that the study of its doctrines is most valuable. As we said above, the modern world has become convinced by bitter experience of the impracticability of mere selfishness as the governing factor in distribution; and the economic thought of the time is concentrated upon devising some new system of society which shall be ruled by justice. On the one hand, we see socialists of various schools attempting to construct a Utopia in which each man shall be rewarded, not in accordance with his opportunities of growing rich at the expense of his fellow-man, but according to the services he performs; while, on the other hand, we find the Christian economists striving to induce a harassed and bewildered world to revert to an older and nobler social ethic. It is no part of our present purpose to estimate the relative merits of these two solutions for our admittedly diseased society. Nor is it our purpose to attempt to demonstrate how far the system of economic teaching which we have sketched in the foregoing pages is applicable at the present day. We must, however, in this connection draw attention to one important consideration, namely, that the mediæval economic teaching was expressly designed to influence the only constant element in human society at every stage of economic development. Methods of production may improve, hand may give place to machine industry, and mechanical inventions may revolutionise all our conceptions of transport and communication; but there is one element in economic activity that remains a fixed and immutable factor throughout the ages, and that element is man. The desires and the conscience of man remain the same, whatever the mechanical environment with which he is encompassed. One reason which suggests the view that the mediæval teaching is still perfectly applicable to economic life is that it was designed to operate upon the only factor of economic activity that has not changed since the Middle Ages--namely, the desires and conscience of man.