"If we see the good for man as happiness, conceived as a single, undifferentiated commodity, we may also suppose that it could be provided for all, in some centrally planned way, if only we could get an authority that was sufficiently powerful and sufficiently intelligent, and also one that we could trust to be uniformly well-disposed to all its subjects; and then the natural corollary would be that all property should be owned by all in common, collectively, and applied to the maximizing of the general happiness under the direction of this benevolent authority. But if we reject this unitary notion of happiness, and identify the good for man rather with the partly competitive pursuit of diverse ideals and private goals, then separate ownership of property will be an appropriate instrument for this pursuit."