Human labor, on the other hand, because it is informed and directed by an understanding which has been socially and culturally developed, is capable of a vast range of productive activities.  The active labor processes which reside in potential in the labor power of humans are so divers as to type, manner of performance, etc., that for all practical purposes they may be said to be infinite, all the more so an new modes of labor can easily be invented more rapidly than they can be exploited.  The capitalist finds in this infinitely malleable character of human labor the essential resource for the expansion of his capital (38).