In the earliest stages the struggle was one for bare existence, not far removed above the lower animals; but as time went on, it began, as we have seen, to take a higher form. The main motive power, however, has always been the self-regarding principle in which the struggle originated. On the whole it was only a more rational and enlightened self-interest which dictated the change from extermination to slavery, from slavery to serfdom, and from serfdom to the system of competitive free labour. Idealism, the longing for a better life, has always had a considerable power in human affairs, and we hope that its influence will never cease to grow and prevail. Yet it could not be seriously maintained that the peoples who instituted slavery, serfdom, or the competitive system, were in the main actuated by ideal or high ethical motives. It is our duty to recognise with thankfulness that the inevitable progress of society has brought with it a higher life, even though it be merely due to a more enlightened self-interest. Thus, while in its early stages it was a struggle for mere existence, in later times it has become more and more a struggle for a privileged or superior existence. The victors in most historic struggles have reserved to themselves the loftier functions of government, war and the chase, and the vanquished have been constrained to provide a subsistence both for their masters and themselves by means of labour. Life still is a struggle for the best places in society. And it is a particular object of struggle not to belong to the class of manual labour. The competitive system is the latest form of the struggle for existence. It is not an accident, but the outcome of the prevalent historic forces. The time had come when free labour was found to be more efficient than servile labour. The feudal system, of which serfdom was a part, went down before the strongly centralised State. The competitive system is the form assumed by the struggle for existence in societies which were controlled by powerful central governments; it is industrial freedom under conditions of legality enforced by strongly constituted governments. In earlier and less settled states of society the struggle for existence used to be decided by more direct and forcible methods. In other days men slew their rivals; at the present time they undersell them. And we need not say that the competitive system has been a process of selection, bringing to the front, as leaders of industry and also as heads of society, the fittest men. The struggle for existence, therefore, has continued through human history, and does still continue. And we may feel assured that under the pressure of an ever-increasing population it will continue. The only question is regarding the form it is likely to take in the historic conditions which now tend to prevail all over the world.