Which of the following may help the procurement professional increase expert power in commercial negotiation?

Expert power is based on a person's high levels of skill and knowledge, formal training, qualifications and experience in a particular procurement category would give someone expert status and mean that in negotiation their voice is listened to as a more objective, informed knowledge leader. Expert power is based on facts, knowledge, research, insight and study.

Legitimate power comes from rules, formal authority, organisation rank, staff rate or official position held.

Reward power comes from one person's ability to compensate or reward another for compliance.

Referent power stems from their personality, way of engaging with others and habit of acting in a way that is in line with a strong set of values and principles.