Why does the law allow principals to be vicariously liable for agents

This is for California law

Why does the law allow principals to be vicariously liable for agents and employees? How does the scope of liability for actions of agents differ from that of employees? Perform legal research and locate one case in which the principal was liable for the action of an agent or employee. Briefly summarize the facts and holding of the case. Make a suggestion for how other businesses could avoid liability in similar situations.