In social science and politics, power is the ability to influence or outright control the behaviour 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, this sort of primitive exercise of power is historically to humans, however as social beings the same concept is seen as good and as something inherited or given for exercising humanistic objectives that will help, enable and move people. In general, it is derived by the factors of interdependence between two entities and the environment. In business, the ethical instrumentality of power is achievement, and as such it is a zero-sum game. In simple terms it can be expressed as being "upward" or "downward". With downward power, a company's superior influences subordinates for attaining organizational goals. When a company exerts upward power, it is the subordinates who influence the decisions of their leader or leaders.