Final answer:
An agent's implied authority that is necessary to carry out their express duties is called incidental authority. Dictatorial authority is imposed by a leader, contrasting with traditional authority, which comes from customs.
Step-by-step explanation:
An agent's implied authority to perform any act reasonably necessary to execute express authority is called incidental authority. This is a form of authority that isn't explicitly stated but is deemed necessary to carry out the expressly authorized duties.
In contrast, express authority is explicitly granted to an agent by the principal, apparent authority is the authority the agent is perceived to have by a third party because of the behaviors of the principal, and customary authority is what is commonly accepted as an authority in the agent's role or profession.
In the context of the types of authority, dictatorial authority, which is characterized by absolute control and commands from the leader, and traditional authority, which is derived from customs and cultural norms, the former does not reside primarily in a leader. Instead, it is imposed by the leader onto others.