The list of possibilities is virtually endless: legal authority, money, prestige, skill, knowledge, charisma, legitimacy, free time, and experience. Pluralists also stress the differences between potential and actual power as it stands. Actual power means the ability to compel someone to do something and is the view of power as a causation. Dahl describes power as a "realistic relationship, such as A's capacity for acting in such a manner as to control B's responses" [A preface to Democratic Theory]. Potential power refers to the possibility of turning resources into actual power. Cash, one of many resources, is only a stack of bills until it is put to work. Malcolm X, for example, was certainly not a rich person. But by using resources such as his forceful personality, organizational skills, he had a greater impact on American politics than most wealthy people. A particular resource like money cannot automatically be equated with power because the resource can be used skillfully or clumsily, fully or partially, or not at all.