Money provides the vehicle for accumulation; it permits the individual to carry his social power, as well as his bond with society, in his pocket. Capital is nothing more, of course, than money put back into production and circulation to yield more money. If money is to represent real values, the same kind of state regulation of money supply and credit is called for. Also, if the profit rate is to be equalized then both capital and labor must be highly mobile, which means that the state must actively remove barriers to mobility when necessary. In general, the state, and the system of law in particular, has a crucial role to play in sustaining and guaranteeing the stability of these basic relationships. The guarantee of private property rights in means of production and labor power, the enforcement of contracts, the protection of the mechanisms for accumulation, the elimination of barriers to mobility of capital and labor and the stabilization of the money system (via central banking, for example), all fall within the field of action of the state. In all of these respects the capitalist state becomes the form of organization which the bourgeois necessarily adopt for internal and external purposes, for the mutual guarantee of their property and interests. The capitalist state cannot be anything other than an instrument of class domination because it is organized to sustain the basic relation between capital and labor.