Property set out with being booty held as trophies of the successful raid. So long as the group had departed and so long as it still stood in close contact with other hostile groups, the utility of things or persons owned lay chiefly in an invidious comparison between their possessor and the enemy from whom they were taken. The habit of distinguishing between the interests of the individual and those of the group to which he belongs is apparently a later growth. Invidious comparison between the possessor of the honorific booty and his less successful neighbours within the group was no doubt present early as an element of the utility of the things possessed, though this was not at the outset the chief element of their value. The man's prowess was still primarily the group's prowess, and the possessor of the booty felt himself to be primarily the keeper of the honour of his group. This appreciation of exploit from the communal point of view is met with also at later stages of social growth, especially as regards the laurels of war. But as soon as the custom of individual ownership begins to gain consistency, the point of view taken in making the invidious comparison on which private property rests will begin to change. Indeed, the one change is but the reflex of the other. The initial phase of ownership, the phase of acquisition by naive seizure and conversion, begins to pass into the subsequent stage of an incipient organization of industry on the basis of private property (in slaves); the horde develops into a more or less self-sufficing industrial community; possessions then come to be valued not so much as evidence of successful foray, but rather as evidence of the prepotence of the possessor of these goods over other individuals within the community. The invidious comparison now becomes primarily a comparison of the owner with the other members of the group. Property is still of the nature of trophy, but, with the cultural advance, it becomes more and more a trophy of successes scored in the game of ownership carried on between the members of the group under the quasi-peaceable methods of nomadic life.