These are the types of power. Acts of leadership, if they are to be effective, must rely on some basis of power. Referent power, in which the person identifies with the other and respects him or her, often has the broadest range of influence. With reward power, there is increased attraction because of the promise of reward and low resistance. Coercive power is likely to produce increased resistance, although the more legitimate the power, the less the resistance. At the right time, when it is functional, each type may be very powerful. In many situations the leader's influence is based on a combination of sources of power, as we see in this example: