" Capitalism is nothing if it is not on the move. Marx is incredibly appreciative of that, and he sets out to evoke the transformative dynamism of capital. That’s why it is so very strange that he’s often depicted as a static thinker who reduces capitalism to a structural configuration. No, what Marx seeks out in Capital is a conceptual apparatus, a deep structure, that explains the way in which motion is actually instantiated within a capitalist mode of production. Consequently, many of his concepts are formulated around relations rather than stand-alone principles; they are about transformative activity. "

― David Harvey , A Companion to Marx's Capital