The ownership of women begins in the lower barbarian stages of culture, apparently with the seizure of female captives. The original reason for the seizure and appropriation of women seems to have been their usefulness as trophies. The practice of seizing women from the enemy as trophies, gave rise to a form of ownership-marriage, resulting in a household with a male head. This was followed by an extension of slavery to other captives and inferiors, besides women, and by an extension of ownership-marriage to other women than those seized from the enemy. The outcome of emulation under the circumstances of a predatory life, therefore, has been on the one hand a form of marriage resting on coercion, and on the other hand the custom of ownership. The two institutions are not distinguishable in the initial phase of their development; both arise from the desire of the successful men to put their prowess in evidence by exhibiting some durable result of their exploits. Both also minister to that propensity for mastery which pervades all predatory communities. From the ownership of women the concept of ownership extends itself to include the products of their industry, and so there arises the ownership of things as well as of persons. In this way a consistent system of property in goods is gradually installed. And although in the latest stages of the development, the serviceability of goods for consumption has come to be the most obtrusive element of their value, still, wealth has by no means yet lost its utility as a honorific evidence of the owner's prepotence. Wherever the institution of private property is found, even in a slightly developed form, the economic process bears the character of a struggle between men for the possession of goods. It has been customary in economic theory, and especially among those economists who adhere with least faltering to the body of modernised classical doctrines, to construe this struggle for wealth as being substantially a struggle for subsistence. Such is, no doubt, its character in large part during the earlier and less efficient phases of industry. Such is also its character in all cases where the "niggardliness of nature" is so strict as to afford but a scanty livelihood to the community in return for strenuous and unremitting application to the business of getting the means of subsistence. But in all progressing communities an advance is presently made beyond this early stage of technological development. Industrial efficiency is presently carried to such a pitch as to afford something appreciably more than a bare livelihood to those engaged in the industrial process. It has not been unusual for economic theory to speak of the further struggle for wealth on this new industrial basis as a competition for an increase of the comforts of life,--primarily for an increase of the physical comforts which the consumption of goods affords.