What kind of power does a leader possess when they have knowledge that others need or desire?

A leader possesses expert power when they have knowledge that others need or desire. This type of power arises from the leader's expertise, skills, and knowledge in a specific area that others recognize as valuable. When people see a leader as the go-to source for important information or skills, they are likely to follow and respect that leader's guidance due to their specialized understanding.

In contrast, reward power involves the ability to give incentives or rewards to others, which is not primarily based on knowledge. Information power refers more to having access to valuable or strategic information rather than being recognized as an expert in a field. Coercive power relates to the ability to impose penalties or exert force, which does not stem from knowledge but rather from authority or the capability to punish. Therefore, expert power correctly describes the scenario where a leader has valuable knowledge sought by others.