In Capital Marx analyzes the true reason for the double movement: on the one hand, capitalism can proceed only by continually developing the subjective essence of abstract wealth or production for the sake of production, that is, production as an end in itself, the absolute development of the social productivity of labor but on the other hand and at the same time, it can do so only in the framework of its own limited purpose, as a determinate mode of production, production of capital, the self xpansion of existing capital.