In social science and politics, power is the ability to influence or outright control the behavior of people. The term "authority" is often used for power perceived as legitimate by the social structure. Power can be seen as evil or unjust, but the exercise of power is accepted as endemic to humans as social beings. In business, power is often expressed as being "upward" or "downward". With downward power, a company's superior influences subordinates. When a company exerts upward power, it is the subordinates who influence the decisions of their leader or leaders.