Infinitely diverse as are these proprietary rights, they {67} have the common characteristic of being so entirely separated from the actual objects over which they are exercised, so rarified and generalized, as to be analogous almost to a form of currency rather than to the property which is so closely united to its owner as to seem a part of him. Their isolation from the rough environment of economic life, where the material objects of which they are the symbol are shaped and handled, is their charm. It is also their danger. The hold which a class has upon the future depends on the function which it performs. What nature demands is work: few working aristocracies, however tyrannical, have fallen; few functionless aristocracies have survived. In society, as in the world of organic life, atrophy is but one stage removed from death. In proportion as the landowner becomes a mere _rentier_ and industry is conducted, not by the rude energy of the competing employers who dominated its infancy, but by the salaried servants of shareholders, the argument for private property which reposes on the impossibility of finding any organization to supersede them loses its application, for they are already superseded. Whatever may be the justification of these types of property, it cannot be that which was given for the property of the peasant or the craftsman. It cannot be that they are necessary in order to secure to each man the fruits of his own labor. For if a legal right which gives $200,000 a year to a mineral owner in the North of England and to a ground landlord in London "secures the fruits of labor" at all, the fruits are the proprietor's and the labor that of some one else. Property {68} has no more insidious enemies than those well-meaning anarchists who, by defending all forms of it as equally valid, involve the institution in the discredit attaching to its extravagances. In reality, whatever conclusion may be drawn from the fact, the greater part of modern property, whether, like mineral rights and urban ground-rents, it is merely a form of private taxation which the law allows certain persons to levy on the industry of others, or whether, like property in capital, it consists of rights to payment for instruments which the capitalist cannot himself use but puts at the disposal of those who can, has as its essential feature that it confers upon its owners income unaccompanied by personal service. In this respect the ownership of land and the ownership of capital are normally similar, though from other points of view their differences are important. To the economist rent and interest are distinguished by the fact that the latter, though it is often accompanied by surplus elements which are merged with it in dividends, is the price of an instrument of production which would not be forthcoming for industry if the price were not paid, while the former is a differential surplus which does not affect the supply.