How do you tell someone possessing a power?

Power is 'the ability to influence the action of others'.

• Reward power - one who can mediate rewards such as promotions, recommendations or answeers to questions.
• Coercive power - the person who can mediate punishments for others: for example, to dismiss, suspend, reprimand them, or make them carry out unpleasnt tasks.
• Referent power - the person who has the resources, or the desire to be like that person: for example, children imitate their parents.
• Expert power - is based upon one person perceiving that the other person has expert knowledge of a given subject and is a recognised authority in a given situation
• Legitimate power - is based on agreement and commonly held values